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fluctuant. adjective. 1  Subject to change or variation: variable: fluctuant oil prices. 2  Medicine Capable of being moved or compressed. 3  Used of an abnormal mass such as a tumor or abscess.4  Moving in waves.djective. 1  Subject to change or variation: variable: fluctuant oil prices. 2  Medicine Capable of being moved or compressed. 3  Moving in waves.
Implied Volatility Rank â IV Rank. Implied volatility (IV) is a forward-looking expectation of price fluctuation. This is derived from an option pricing model and carries great importance in the pricing of options. However, due to multiple inputs in option pricing models, IV can (and typically does) constantly fluctuate.