# theorem

> English word · Noun · IPA /ˈθiː.ə.ɹəm/ · frequency rank #11,135

## Definitions
1. 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.
2. A mathematical statement that is expected to be true.
3. A syntactically correct expression that is deducible from the given axioms of a deductive system.

## Etymology
From Middle French théorème, from Late Latin theōrēma, from Ancient Greek θεώρημα (theṓrēma, “speculation, proposition to be proved”) (Euclid), from θεωρέω (theōréō, “I look at, view, consider, examine”), from θεωρός (theōrós, “spectator”), from θέα (théa, “a view”) + ὁράω (horáō, “I see, look”). See also theory, and theater.

## Easily confused with
- **there** (https://plainspell.com/en/vs/theorem-vs-there)
- **theory** (https://plainspell.com/en/vs/theorem-vs-theory)
- **theres** (https://plainspell.com/en/vs/theorem-vs-theres)
- **theories** (https://plainspell.com/en/vs/theorem-vs-theories)

## Common misspellings (10)
`hteorem`, `tehorem`, `theoerm`, `theoremm`, `theorme`, `theorrem`, `theroem`, `thheorem`, `thoerem`, `ttheorem`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/theorem