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How to actually remember new words — methods that work, methods that don't

By the TBS Digital team · Updated 2026-05-05

The best way to remember new words is to combine spaced repetition with active use. Encounter the word in context, write your own sentence with it, add it to a spaced-repetition tool such as Anki, and use it in speech or writing within 24 hours. Repeat at expanding intervals over two weeks. Passive re-reading alone does not produce lasting retention.

Does spaced repetition actually work?

The short answer is yes, and the evidence is unusually strong. Spaced repetition is not a productivity trend; it is one of the most replicated findings in cognitive psychology. Hermann Ebbinghaus documented the "forgetting curve" in 1885, showing that memory decays exponentially after learning but that timely review arrests the decay and rebuilds the trace at a higher level. Every subsequent review at the right moment extends retention further, until the word becomes effectively permanent.

Ebbinghaus ran his experiments on himself, memorising lists of nonsense syllables and tracking how quickly he forgot them. His core insight was that the interval between study sessions matters more than the total time spent studying. Two one-hour sessions spread a week apart produce better retention than a single two-hour session. That principle, called the spacing effect, underpins every modern spaced-repetition system. A useful summary of the original research is available via the Wikipedia article on the forgetting curve, which cites the primary sources.

The practical implementation of spaced repetition for vocabulary is Anki, a free, open-source flashcard application that uses the SM-2 algorithm to schedule each card individually. When you rate a card as easy, Anki pushes the next review further into the future. When you rate it hard, it brings the review back sooner. The Anki manual explains the algorithm in detail. The system does not require discipline to use correctly; it requires discipline to add cards regularly. The algorithm takes care of scheduling.

What spaced repetition produces, specifically, is strong declarative recall: given a prompt ("petrichor"), you can retrieve the meaning. That is genuinely useful. But it is worth being clear about what it does not produce on its own: it does not teach you how to use a word naturally, which collocations it prefers, or what register it belongs to. Those come from reading and speaking, not from card drills. SRS and contextual exposure are complements, not substitutes.

Are flashcards better than reading for vocabulary?

This question is posed as an either-or but the research suggests it is the wrong frame. Flashcards and reading in context do different things, and both are needed for complete word knowledge.

Flashcards produce what researchers call "form-meaning mapping" — you can retrieve the translation or definition when you see the word. This is measurable, teachable, and reliable. Paul Nation, whose work on vocabulary acquisition has been influential in applied linguistics, distinguishes between "knowing a word" at different levels: recognising it, recalling it, using it correctly. Flashcards get you reliably to the first two levels. They struggle with the third.

Reading in context gives you something flashcards cannot: exposure to the word in its natural habitat. You see what words surround it, what grammatical structures it appears in, whether it is neutral or loaded, formal or casual. Acquisition researchers estimate that reading produces incidental learning of around one new word per roughly 10 encounters with it — much slower than deliberate study, but the depth of knowledge acquired through incidental exposure tends to be richer. The word arrives connected to meaning rather than as a isolated label.

The strongest vocabulary learners, empirically, use both: they study a core set of words deliberately (flashcards, SRS, word lists) and expose themselves to large amounts of text. Extensive reading without deliberate study produces slow vocabulary growth in the early stages, when you do not yet know enough words to infer meaning reliably. Deliberate study without reading produces "shallow" vocabulary — words you can define but stumble over in actual conversation. The Pimsleur method, developed by applied linguist Paul Pimsleur in the 1960s, recognised this early: its audio programs embed deliberate spaced repetition inside conversational context, combining both approaches in a single study session.

If you have to choose one, reading wins for native speakers building vocabulary in their own language. For second-language learners at the beginner to intermediate stage, deliberate study with SRS is more efficient — you simply cannot read enough at that level to hit the repetition threshold that produces retention. By the intermediate to advanced stage, extensive reading should dominate.

Is the Leitner system worth setting up?

Sebastian Leitner's box system, described in his 1972 book So lernt man lernen ("How to learn to learn"), is a physical implementation of spaced repetition using index cards sorted into numbered boxes with different review frequencies. Cards in box 1 are reviewed every day, cards in box 2 every other day, cards in box 3 every week, and so on. A card that you answer correctly is promoted to the next box; a card you answer incorrectly drops back to box 1. The Wikipedia entry on the Leitner system covers the mechanics clearly.

The system works. It is the same core principle as Anki, implemented with cardboard and a timer. For people who prefer physical materials, or who want to study without a screen, the Leitner box is a legitimate option. There is also some evidence that handwriting the cards produces better encoding than typing them — the motor effort and the slower pace of handwriting may force deeper processing of the content.

The practical drawbacks are portability and scale. A box of 500 physical cards is unwieldy to carry. Scheduling is manual: you have to remember which box to review on which day. Errors accumulate if you miss a day. Digital SRS tools handle all of this automatically and scale to tens of thousands of cards without friction.

For most learners today, the answer to "is the Leitner system worth setting up?" is: the principles are worth internalising, but the digital implementation (Anki or a similar tool) is more practical. If you already use physical notecards for other study purposes and want to avoid another app, the Leitner box is a perfectly functional approach. The scheduling fidelity is lower than an algorithm, but the core mechanism — review more often when you fail, less often when you succeed — is correct.

How long does it take to make a word stick?

The research is more specific than most learners expect. A widely cited 2003 paper by Paul Nation and colleagues estimated that adult learners need somewhere between 10 and 15 exposures to a word, across different contexts and modes, to move it into reliable long-term memory. A 2020 meta-analysis published in PubMed-indexed journals on vocabulary acquisition broadly confirmed this range, with the caveat that "exposure" means effortful retrieval, not passive re-reading. Re-reading the same definition twice does not count as two exposures in the meaningful sense; it registers as one shallow pass.

The time horizon depends on how you space those exposures. If you encounter a word once per day over 14 days, you are in the right range. If you cram 15 exposures into a single afternoon, you will recognise the word tomorrow and struggle to retrieve it a month later — the massed-practice effect documented by Ebbinghaus.

The practical implication for learners using Anki is that new words are typically "mature" (moved to the longest intervals) after three to four weeks of regular use. At that point, the card might be reviewed once a month — a very light maintenance cost. Words in the mature phase can remain in long-term memory for years with minimal review, provided you occasionally encounter them in reading or conversation. Words that are never encountered outside the SRS tend to decay even from the mature queue; language is a skill that requires environmental input, not a static database.

Some words stick on a single encounter. These are almost always words that arrived with strong emotional charge — a word you needed desperately in a conversation and did not have, a word that crystallised a feeling you had never named, a word whose etymology surprised you in a way that stayed. Serendipity is a good example: people who learn that Horace Walpole coined it in 1754 from a Persian fairy tale about the princes of Serendip — who made discoveries by accident and sagacity — rarely forget the word again. The story acts as a retrieval hook. Etymology is one of the most powerful mnemonic devices available to vocabulary learners, and it is why sites like this one lead with it.

Why do some words stick instantly and others vanish?

The answer lies in how memory actually works. Human memory is not a filing cabinet; it is a network of associations. A new word is stored not as an isolated unit but as a node in a web of connections — to related words, to images, to emotional states, to the context in which you first encountered the word. The richer and more numerous those connections, the more retrieval routes exist. A word with ten connections is ten times easier to recall than a word with one.

Words that stick instantly tend to have one or more of the following properties. They fill a gap: you have experienced the concept but never had a precise name for it, so the word arrives as a relief. Sonder — the realisation that every stranger you pass has a life as complex and vivid as your own — is frequently cited as an example. The concept was not new to anyone who heard it; the word simply captured it. Words that name experiences are easier to retain than words that name abstractions with no felt equivalent.

They are phonologically distinctive. A word that sounds like nothing else in the language is harder to confuse and easier to recall. Petrichor — the smell of rain on dry earth — does not rhyme with anything most English speakers know. Its strangeness is part of its memorability.

They have a good story. As noted above, knowing that ephemeral comes from the Greek ephemeros ("lasting only a day," from epi- "on" + hemera "day") gives you a structural hook that survives far longer than a bare definition. Etymology does not work for every word — some etymologies are too distant or too irregular to help — but for a substantial portion of English vocabulary, especially the Latinate and Greek-derived academic register, it is a highly efficient mnemonic.

They appear repeatedly in your reading. Words that you encounter once in a controlled study session and never again are fighting against the forgetting curve with no allies. Words that appear in your regular reading environment get bonus retrievals for free. One useful strategy: after deliberately studying a word, pay explicit attention to it for the next two weeks. Notice it in newspapers, flag it when a podcast host uses it, pause when it appears in a novel. The mere act of noticing triggers a retrieval event that reinforces the memory trace.

Words vanish when none of these conditions are met: they are abstract, they do not fill a felt gap, they have no memorable etymology, and they appear in your input so rarely that the spaced-repetition algorithm is the only retrieval event. For words in that category, the answer is deliberate and patient SRS work. There is no trick that bypasses the forgetting curve entirely; there are only tools that work with it more efficiently.

The honest tradeoffs: what each method does and does not give you

It is worth being direct about the limits of each approach, because language learning advice has a long tradition of promising more than it delivers.

Spaced repetition produces reliable declarative recall. It does not produce fluency, naturalness, or understanding of register. An Anki deck of 5,000 words will not make you sound like a native speaker. It will make you able to understand more text and pass vocabulary tests. Those are real gains. Do not mistake them for the full picture.

Flashcards (not SRS) — static decks reviewed in a fixed order — are considerably weaker than algorithmically scheduled repetition. If you are using physical or digital cards without adaptive scheduling, you are spending time on cards you already know and neglecting cards you are about to forget. The scheduling is the mechanism; the card is just the delivery format.

Extensive reading builds deep word knowledge and strong implicit grammar but is slow for vocabulary expansion when you are below an intermediate threshold. If you know fewer than 3,000 words in a language, reading authentic texts is exhausting and inefficient. Deliberate study to get past that threshold first makes extensive reading far more productive.

Using a word in conversation is the strongest possible reinforcement signal — stronger than any study method. The emotional stakes, the real-time retrieval pressure, and the feedback loop (did the listener understand you?) combine to produce a uniquely powerful encoding event. If you can find any opportunity to use a new word in genuine communication within 24 hours of learning it, use it. Even in a private journal, the act of generating output — as opposed to recognising input — is meaningfully more effective than another passive review pass.

A practical workflow for the next two weeks

Based on the evidence above, here is a minimal workflow that covers the main leverage points without requiring heavy time investment:

  1. When you encounter a word you do not know — in reading, in conversation, anywhere — note it down immediately with the sentence in which you found it.
  2. Look up the definition, pronunciation, and if possible the etymology. Spend two minutes, not twenty.
  3. Write one sentence using the word yourself. Make it personal, concrete, and if possible slightly absurd — memorable sentences are better than bland ones.
  4. Add a card to Anki (or your chosen SRS tool) with the word on the front and the definition plus your sentence on the back.
  5. Do your Anki reviews every day. The daily session rarely exceeds 10-15 minutes once the deck is established. Skipping days allows reviews to pile up and breaks the spacing schedule.
  6. Within 24 hours, find one opportunity to use the word actively — in speech, in writing, in a message. Do not wait for a natural opportunity; engineer one.
  7. Stay alert for the word in your reading environment for the next two weeks. Each encounter reinforces without requiring any extra effort.

This workflow does not require an expensive app, a language tutor, or unusual discipline. It requires a note-taking habit and a 10-minute daily review. The payoff — words that remain accessible months and years later — is disproportionate to the input.

Sources & further reading

Related reading on this site