Definition of fluctuate

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fluc·tu·ate    (flkch-t) KEY 

VERB:
fluc·tu·at·ed, fluc·tu·at·ing, fluc·tu·ates
VERB:
intr.

1. To vary irregularly. See Synonyms at swing.
2. To rise and fall in or as if in waves; undulate.

VERB:
tr.

To cause to rise and fall or vary irregularly.

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ETYMOLOGY:
Latin flcture, flctut-, from flctus, a flowing, from past participle of fluere, to flow; see bhleu- in Indo-European roots

OTHER FORMS:
fluctu·ant  (-nt) KEY (Adjective), fluctu·ation(Noun)