# formulae

/ˈfɔɹmjəˌɫeɪ/ (US) · /fˈɔːmjʊlˌiː/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/formulae
Updated: 2026-05-28

## Definition

the plural form of formula. These are sets of rules, symbols, or ingredients used to solve a problem or make something.

For teachers: the plural of 'formula', specifically in mathematical, scientific, or technical contexts. Refers to fixed patterns of symbols or rules used to express relationships or achieve a specific result.

## Examples

- The students memorized several chemical formulae for the exam.
- The software uses complex mathematical formulae to calculate the trajectory of the satellite in real time.
- While 'formulas' is common in general speech, scientific journals often prefer 'formulae' when discussing the precise chemical compositions of the newly discovered compounds.

## Pitfalls

- Not "These formulae is correct." but "These formulae are correct." — Formulae is a plural noun and requires a plural verb agreement.

## Usage notes

- A Latin-style plural of 'formula'. In modern English, 'formulas' is more common in general contexts, while 'formulae' is preferred in scientific and mathematical writing.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.