reactivity
/rɪˈakˈtɪvɪti/noun
reactivity is spelled R-E-A-C-T-I-V-I-T-Y: 10 letters and 5 syllables. It appears about once in every 1 million words in written English, the 33,236th most frequent word form (wordfreq, 2021 data). As a noun, reactivity means “responsiveness to stimulation” (English Wiktionary, September 2026). The plural of reactivity is reactivities.
How many letters and syllables are in reactivity?
| Letters | 10: R-E-A-C-T-I-V-I-T-Y |
|---|---|
| Syllables | 5 (from its American pronunciation) |
| In writing | about once in every 1 million words; the 33,236th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is reactivity?
Reactivity appears about once in every 1 million words in written English, the 33,236th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce reactivity?
- /rɪˈakˈtɪvɪti/
Reactivity has 5 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Flame,_not_lame-reactivity.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with reactivity?
No other word on PlainSpell ends in the same sounds as reactivity.
Spelled with the same letters in another order: creativity.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of reactivity
- reactivities plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does reactivity mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
responsiveness to stimulation
- 2
relative susceptibility to chemical reaction
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Reactivity in Spanish, French, German and Portuguese
In the sense relative susceptibility to chemical reaction:
| Language | Words |
|---|---|
| French | réactivité |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does reactivity come from?
From reactive + -ity.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).