You've studied the same English word five times — and still forgotten it by next week. Sound familiar?
The problem isn't your memory. The problem is when you review.
What Is Spaced Repetition?
Spaced repetition is a study technique where you review information at increasing intervals — right before your brain is about to forget it.
Instead of studying 50 words in one sitting (massed practice), you spread reviews across days:
- Day 1: Learn "ephemeral"
- Day 2: Review it
- Day 4: Review it again
- Day 9: Review
- Day 21: Review
- …and so on
Each time you successfully recall a word, the algorithm pushes the next review further into the future. Each time you struggle, the interval resets to a shorter window.
Why Does Spaced Repetition Work?
Two psychological principles make spaced repetition so effective:
The Spacing Effect
In 1885, Hermann Ebbinghaus discovered what's now called the forgetting curve: we forget most of what we learn within 24 hours. But every time we retrieve a memory, we reset and strengthen it.
Spaced repetition exploits this perfectly — you review at the moment of maximum forgetting, forcing your brain to reconstruct the memory from scratch. This reconstruction process is what makes the memory stick.
This is not just a study hack. A review of distributed practice by Cepeda and colleagues in Psychological Science found that spacing learning over time usually supports better retention than massed practice. See the paper on SAGE Journals.
Retrieval Practice
Passive re-reading (looking at the word again) is almost useless. Active recall — trying to remember the word before seeing it — is far more effective. This is called the testing effect, and spaced repetition builds it in by design.
In a Science paper, Roediger and Karpicke showed that retrieval practice can support long-term retention better than simply re-reading material. See the paper on Science.
What the Research Really Suggests
Instead of promising one fixed recall number for every learner, the better takeaway is:
- cramming can feel effective in the short term;
- spaced review forces memory retrieval, which helps long-term learning;
- self-testing is usually stronger than passive re-reading;
- results depend on item difficulty, timing, and question quality.
How to Apply Spaced Repetition to English Vocabulary
The biggest barrier is setup time. Manually tracking which words to review and when is tedious. This is why software like WordNote handles it automatically:
- Capture the word when you encounter it — while reading, watching, browsing
- Get the explanation — definition, examples, pronunciation, memory tips
- The algorithm schedules reviews — you just show up for 9 minutes a day
The power of spaced repetition isn't in any single session. It's in the compound effect of consistent, well-timed reviews over weeks and months.
Spaced Repetition vs Other Study Methods
| Method | Strength | Weakness |
|---|---|---|
| Spaced repetition | Strong for long-term retention | Requires consistency |
| Massed practice | Useful for short-term pressure | Easy to forget |
| Re-reading | Easy to start | Creates an illusion of knowing |
Want to understand the full picture of how to memorize English vocabulary effectively? Read our complete guide on the five principles that make vocabulary stick. If you often meet casual words in videos or comments, our guide to English slang explains why real context matters more than a direct translation.
Using Spaced Repetition for TOEIC
Spaced repetition is especially powerful when paired with a focused word list. If you're preparing for the TOEIC exam, see our guide on TOEIC vocabulary study strategies — which explains exactly how to target the words that matter most for your score.
The One Habit That Changes Everything
Spaced repetition only works if you review consistently. Miss a day, and a handful of words will drift back toward forgotten. Miss a week, and you'll face a backlog.
The good news: with a system like WordNote, a short daily session is enough to build the habit. The algorithm does the hard work. You just need to show up.
FAQ
Is spaced repetition better than flashcards?
Spaced repetition is flashcards — done scientifically. Traditional flashcards reviewed randomly don't account for forgetting curves. Spaced repetition schedules each card at the optimal interval, making the same study time far more efficient.
How long should each spaced repetition session be?
9–15 minutes per day is enough for most learners. The key isn't the length of each session — it's showing up every day. Short, consistent sessions outperform long, irregular ones.
Can spaced repetition work without an app?
Technically yes — the Leitner box system uses physical cards. But tracking intervals manually is tedious. An app like Eng·noting automates the scheduling so you can focus on learning, not logistics.
What happens if I miss a spaced repetition review?
Your overdue words don't disappear — they pile up. Reviews missed by 1–2 days usually bounce back quickly. Missing a week means more effort to re-learn. The solution: keep sessions short enough that skipping never feels justified.
How is spaced repetition different from cramming?
Cramming loads as much as possible into one session right before a test. Spaced repetition distributes learning over time. Cramming produces short-term retention; spaced repetition produces long-term memory. The difference is measurable years later.
Ready to put this into practice? Start your free vocabulary notebook →