How to Learn the Common Prefixes
A prefix is a few letters on the front of a word that change its meaning — "un-" flips it, "re-" repeats it, "pre-" means before. Learn a couple of dozen and you can decode thousands of words you have never seen. This deck covers the essentials.
There are 12 cards in the deck below. You can read through them, practise them right here with the flip-card player, and then save the deck to study properly with spaced repetition — the method that makes them stick for months, not minutes.
Why the common prefixes is hard to memorize (and the fix)
Many prefixes look similar or overlap (in-, im-, il-, ir- all mean "not"), and a few have two meanings (in- can mean "not" or "into"). Learning the core meaning with an example word fixes them.
The fix is active recall plus spaced repetition. Instead of re-reading the list (which feels productive but barely works), you test yourself — pull each answer out of memory — and you review each card on a schedule that stretches over time. Every time you successfully recall a fact, the memory gets stronger and the next review is pushed further out. That's how you go from "I saw it once" to "I just know it."
The fastest way to learn the common prefixes
- Break it into small batches. Learn the negatives first (un-, dis-, non-, in-), then the time/order ones (pre-, post-, re-), then the position ones (sub-, inter-, trans-).
- Test, don't re-read. Look at the question, say the answer out loud before flipping the card. The little struggle to recall is what builds the memory — a smooth re-read does almost nothing.
- Review on a schedule. Spaced repetition shows you each card right before you'd forget it. Get one right and it comes back in a few days, then a week, then a month. Miss one and it comes back sooner.
- Keep sessions short and daily. Five to ten minutes a day beats a two-hour cram every time. Consistency is the whole game.
One fact per card. Learn one example word with each prefix (re- → rebuild) so the meaning has a hook.
The full deck: the Common Prefixes
Here's every card in the set. Practise them above, or save the deck and let spaced repetition schedule your reviews automatically.
| Prefix | Meaning (example) |
|---|---|
| What does the prefix "un-" mean? | Not / the opposite of (unhappy, undo) |
| What does the prefix "re-" mean? | Again or back (redo, return) |
| What does the prefix "pre-" mean? | Before (preview, prehistoric) |
| What does the prefix "post-" mean? | After (postpone, postwar) |
| What does the prefix "dis-" mean? | Not / away (disagree, disappear) |
| What does the prefix "mis-" mean? | Wrongly (misspell, misunderstand) |
| What does the prefix "sub-" mean? | Under / below (submarine, subway) |
| What does the prefix "inter-" mean? | Between (international, interact) |
| What does the prefix "trans-" mean? | Across (transport, transatlantic) |
| What does the prefix "anti-" mean? | Against (antifreeze, antibiotic) |
| What does the prefix "auto-" mean? | Self (automatic, autobiography) |
| What does the prefix "bi-" mean? | Two (bicycle, bilingual) |
Save this deck and actually remember it
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Study this deck free →FAQ: learning the common prefixes
How long does it take to learn the common prefixes?
Most people can lock in the common prefixes within one to three weeks of short daily sessions. With spaced repetition doing 10–12 cards a day, you'll recognise them within days and recall them reliably within a couple of weeks.
What's the best way to memorize the common prefixes?
Active recall plus spaced repetition. Test yourself instead of re-reading, and review on a schedule that spaces the cards out over time. Flashcards are built for exactly this — which is why the deck above is the fastest path.
Is this deck free?
Yes. You can practise all 12 cards on this page for free with no account. Sign up (also free) to save the deck and let spaced repetition schedule your reviews so it sticks long-term.