A person or thing whose nature or value is a mystery.
Used other than figuratively or idiomatically: see unknown, quantity.
Something whose value may be dictated or discovered.
A quantity that may assume any one of a set of values.
A shifting wind, or one that varies in force.
A variable star.
A symbol representing a variable.
Something that is variable.
Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.
A named memory location in which a program can store intermediate results and from which it can read them.
Able to vary or be varied.
Having no fixed quantitative value.
Likely to vary.
Marked by diversity or difference.
Tending to deviate from a normal or recognized type.