fluctuate
/ˈflʌkt͡ʃu.eɪt/
"fluctuate" is a 9-letter English headword indexed on PlainSpell.
The verdict
“fluctuate” is a moderately-common English word, ranked #29,276 in English word frequency and used as a verb.
- #29,276
- frequency rank, English
- 9
- letters
- 13
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - To vary irregularly; to swing.
| Property | Value |
|---|---|
| Headword | fluctuate |
| Language | English |
| Part of speech | Verb |
| IPA | /ˈflʌkt͡ʃu.eɪt/ |
| Letters | 9 |
| Frequency rank | #29,276 |
| Misspellings tracked | 13 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “fluctuate” sits in English frequency
Spelling & Dictionary Insight
The English entry for fluctuate is 9 letters long, classified as a verb, and transcribed in the International Phonetic Alphabet as /ˈflʌkt͡ʃu.eɪt/. Corpus data places it at rank #29,276 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 5 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 13 likely wrong-spelling variants for fluctuate, with forms such as "ffluctuate", "flcutuate", and "flluctuate". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: First attested in the 1630'; borrowed from Latin flūctuātus, perfect passive participle of flūctuō (“(of the sea) to surge, swell; (of man) to waver, fluctuate”), see -ate (verb-forming suffix) and -ate (adjective-forming suffix). The correct English form is fluctuate, spelled F-L-U-C-T-U-A-T-E.
Definition
- 1To vary irregularly; to swing.
- 2To undulate.
- 3To be irresolute; to waver.
- 4To cause to vary irregularly.
- 5To rise and fall as a wave; to be tossed up and down the waves.
Etymology
First attested in the 1630'; borrowed from Latin flūctuātus, perfect passive participle of flūctuō (“(of the sea) to surge, swell; (of man) to waver, fluctuate”), see -ate (verb-forming suffix) and -ate (adjective-forming suffix).
This word in other languages
Common misspellings
Also misspelled as: ffluctuate,flcutuate,flluctuate,flucctuate,fluctaute,flucttuate,fluctuaet,fluctuatte,fluctutae,flucutate,flutcuate,fulctuate,lfuctuate
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of fluctuate - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
How do you spell "fluctuate"?
What does "fluctuate" mean?
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Using “fluctuate”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-L-U-C-T-U-A-T-E - every other letter order is a misspelling in standard orthography.
- Say it as /ˈflʌkt͡ʃu.eɪt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.