Which to use
“theorem” and “theories” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #11,135
- “theorem” frequency rank
- #4,989
- “theories” frequency rank
- 16124
- confusion score
Side-by-Side Comparison
| Feature | theorem | theories |
|---|---|---|
| Definition | A mathematical statement of some importance that has been proven to be true. Minor theorems are often called propositions. Theorems which are not very interesting in themselves but are an essential part of a bigger theorem's proof are called lemmas. | plural of theory |
Where the spellings diverge
Shared letters are muted; the letters that actually set theorem and theories apart are highlighted. They share 6 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
A purely visual mix-up. theorem (/ˈθiː.ə.ɹəm/) and theories (/ˈθɪəɹiz/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 16124, derived from the frequency rank of both members and their visual similarity.
theorem is recorded at frequency rank #11,135, classified as anoun, pronounced /ˈθiː.ə.ɹəm/. theories is at rank #4,989, tagged as anoun, pronounced /ˈθɪəɹiz/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 16124, this pair ranks #459,732 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of theorem vs theories
Shared letters: ehort. Private to "theorem": m. Private to "theories": is.
"theorem" · 7 letters · shape CCVVCVC · "theories" · 8 letters · shape CCVVCVVC
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "theorem" and "theories" be used interchangeably?
Which is more common, "theorem" or "theories"?
Remembering theorem vs theories
The fastest way to pick the right one every time.
- Read both glosses above and match the meaning you intend, only context separates this pair.
- See each word in full, definition, IPA, etymology and its other confusables. Full “theorem” entry
- Browse more pairs most likely to be confused. Most confusable