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PlainSpell

experiment

ex·per·i·ment/ɪkˈspɛɹ.ə.mənt/noun, verb

experiment is spelled E-X-P-E-R-I-M-E-N-T, 4 syllables: ex·per·i·ment. The wrong spelling people search most is experiement: about 40 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 65 of all searches for the word. Experiment is a noun meaning “A test under controlled conditions made to either demonstrate a known truth, examine the validity of a…”. The plural of experiment is experiments.

How many letters and syllables are in experiment?

Letters10: E-X-P-E-R-I-M-E-N-T
Syllables4: ex·per·i·ment
In writing24 times per million words; the 3,752nd most frequent word form
Wrong spellings searched1; the most searched, experiement, about 40 Bing searches a month (all of them)

Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).

How do you spell experiment?

Experiment is spelled E-X-P-E-R-I-M-E-N-T. One wrong spelling is searched or written often enough to measure; together they are about 1 in 65 of the searches for experiment in either form.

experimentthe right spelling2,540 searches a month
experiementan extra e40 searches a month

Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.

How common is experiment?

Experiment appears 24 times per million words in written English, the 3,752nd 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 experiment?

  • UK /ɪkˈspɛɹ.ɪ.mənt/
  • UK /ɛkˈspɛɹ.ɪ.mənt/
  • US /ɪkˈspɛɹ.ə.mənt/

As a verb (“To conduct an experiment”): /ɪkˈspɛɹ.ɪ.mɛnt/, /ɪkˈspɛɹ.ə.mɛnt/.

Experiment has 4 syllables, split ex·per·i·ment in writing.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-experiment.ogg, Wikimedia Commons (author and licence on each file's page).

Forms of experiment

  • experiments plural, present, singular, he/she/it
  • experimenting participle, present
  • experimented participle, past

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What does experiment mean?

The meanings the English Wiktionary records, quoted as written there (source below).

noun

  1. 1

    A test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy or likelihood of something previously untried.

    conduct an experiment

  2. 2

    obsoleteExperience, practical familiarity with something.

verb

  1. 1

    To conduct an experiment.

    We're going to experiment on rats.

  2. 2

    obsoleteTo experience; to feel; to perceive; to detect.

    The Earth, the which may have carried us about perpetually ... without our being ever able to experiment its rest.

  3. 3

    obsoleteTo test or ascertain by experiment; to try out; to make an experiment on.

  4. 4

    To try something to observe the results.

    I want to experiment with psychedelics.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Experiment in Spanish, French, German and Portuguese

LanguageWords
Frenchexpérience (test under controlled conditions), expérimenter (to conduct an experiment)
GermanExperiment, Versuch (test under controlled conditions), experimentieren (to conduct an experiment)
Portugueseexperimento, experiência (test under controlled conditions), experimentar (to conduct an experiment)
Spanishexperimento (test under controlled conditions), experimentar, expermentar (to conduct an experiment)

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 experiment come from?

From Middle English experiment, from Old French esperiment (French expérience), from Latin experimentum (“experience, attempt, experiment”), from experior (“to experience, to attempt”), itself from ex + *perior, in turn from Proto-Indo-European *per-.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What to look up after experiment