DEFINITION of 'NonFluctuating'
The characteristic of constancy in a security or measurement's value, rate of change or other metric. Nonfluctuating is a feature of a fixedrate asset which has a constant yield, such as a governmentissued debenture (which, however, the market price of the debenture will fluctuate as interest rates change.) A nonfluctuating characteristic is the opposite of a volatile characteristic where changes in value do occur. An investment that has nonfluctuating returns with little risk tends to have lower returns than investments that are exposed to volatility.
BREAKING DOWN 'NonFluctuating'
In contrast, common stock of a public corporation is more likely to fluctuate in both dividend yield and market price. Dividends paid on preferred stock are nonfluctuating; that is, they are paid at a fixed rate. Dividends paid on common stock, on the other hand, can fluctuate, though some secure and stable companies, such as blue chips, may offer steady dividends. Other nonfluctuating investments include money market funds (which are similar to savings accounts), savings accounts and certificates of deposit.

Implied Volatility  IV
The estimated volatility of a security's price. 
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Historical Volatility  HV
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