Spaced Repetition for English Vocabulary: How to Learn Efficiently
Spaced repetition is probably the most reliable way to keep English words in your memory. Let's break down what the method is, why it works, and how to use it without turning study into a grind.
What spaced repetition is
Spaced repetition is a technique where you return to a word you've learned at growing intervals. Not every day in a row and not "whenever it comes to mind," but on a schedule: first after a short gap, then after longer and longer ones.
The idea is to review a word at the moment you're just about to forget it. That effort to recall, right on the edge of forgetting, strengthens memory the most. Review earlier and it's wasted time; review later and the word has already faded, so you're learning it from scratch.
Why the method works
Your memory follows the so-called forgetting curve: without review, a new word fades fast in the first day. Each well-timed review "restarts" that curve and makes the memory trace more durable — forgetting slows down, and the gaps between reviews can grow.
I wrote separately about why words fade: why you forget English words.
The point is simple: you're not trying to learn a word "once and for all" — you're reminding yourself of it exactly as many times, and exactly when, your memory needs.
What the review schedule looks like
The exact intervals differ from system to system, but the logic is the same — the gaps grow roughly like this:
- first review — the same day or the next;
- then after 2–3 days;
- after a week;
- after 2–3 weeks;
- after a month, then after several months.
If you recall a word easily at a review, the interval grows. If you stumble, the system brings the word back sooner to reinforce it. That's how the schedule adapts to how firmly each word sits in your head.
How to use the method in practice
Paper flashcards
The classic version: the word on one side, translation and an example on the other. Cards are sorted into boxes with different intervals (the Leitner system). It works, but managing a schedule for hundreds of words by hand is hard, and easy to lose track of.
Apps
That's why most people use apps: they count the intervals for you and show you exactly the words due today. All you have to do is study. This algorithm is the engine behind Anki, Quizlet and other services — there's a comparison in which app to choose for English words.
Common mistakes
- Reviewing too often. Drilling the same word every day wastes time on what you already know.
- Skipping days. Gaps break the intervals — reviews pile up and motivation drops.
- Translation only, no example. Intervals decide when to review, but reviewing a bare translation transfers poorly to real speech. Active recall and varied context help — see how to memorize English words.
- Adding too much new at once. Every new word creates future reviews; 10–15 a day is a manageable pace.
Spaced repetition in Vocabulex
The app keeps the review schedule for you and shows each word in a new example every time — all you do is recall.
