# spontaneity

/ˌspɑntəˈniəti/ (US) · /spɒntˈeɪnɪti/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/spontaneity
Updated: 2026-05-20

## Definition

the quality of being able to act or react quickly and naturally without thinking about it first. In biology, it describes a process that happens naturally without being caused by a specific person or thing.

For teachers: the quality of being able to act or react quickly and naturally without external prompting. In a biological context, it refers to a process or reaction that occurs naturally and without deliberate intervention.

## Examples

- The spontaneity of the reaction surprised the scientists.
- The spontaneity of the chemical reaction allowed the researchers to produce the compound much faster than expected.
- The spontaneity of the cellular response to the stressor suggests that the organism has evolved a highly efficient and immediate defense mechanism against environmental changes.

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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.