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Definition of fluctuation : 1. A motion like that of waves; a moving in this and that direction; as, the fluctuations of the sea.
2. A wavering; unsteadiness; as, fluctuations of opinion; fluctuations of prices.
3. The motion or undulation of a fluid collected in a natural or artifical cavity, which is felt when it is subjected to pressure or percussion.

Synonyms:

hesitation, wavering, mutant, variant, pas seul, sport, change, version, variance, variation, edition, magnetic declination, magnetic variation

effect, adjustment, shake-up, evolution, reform, transformation, alteration, correction, trend

fickleness, changeability, indecisiveness, impulsiveness, fancifulness, caprice, sporadicalness, flightiness, vagary, volatility, whim, whimsy, fancy, fleetingness, fitfulness, arbitrariness, randomness

mutation, permutability, modifiability, malleability, plasticity, unreliability, pliancy

inconstancy, asymmetry, jerkiness, intermittence, irregularity, unevenness, capriciousness, eccentricity, variability

beat, undulation, palpitation, vacillation, wave, alternation, harmonic motion, rhythm, tremor, vibration, resonance, pulsation, throb, libration, oscillation, pulse

Usage examples:

• Forbes had indicated that the most urgent need was for automatic registration of wind data, as the erratic fluctuation of the wind demanded more frequent observation than any manual system could accomplish. - "The Introduction of Self-Registering Meteorological Instruments", Robert P. Multhauf.
• It's fluctuation that gives a man a chance." - "Herbert Carter's Legacy", Horatio Alger.
• There is a good deal of evidence that behind them is a corresponding fluctuation in the amount the thyroid secretes into the blood. - "The Glands Regulating Personality", Louis Berman, M.D..