Apt to change; changing or altering in a physical sense; liable to change; changeable.In botany and zoology, embracing many individuals and groups (varieties, subspecies, forms, states) which depart somewhat from the strict type: said of a species or, in a similar sense, of some particular character.Liable to vary or change, in a moral sense; mutable; fickle; inconstant: as, variable moods.Capable of being varied, altered, or changed; liable to change; alterable; in grammar, capable of inflection.In mathematics, quantitatively indeterminate, and considered with reference to the various determinations of quantity that are possible in the case. See II.In astronomy, changing in brightnessSynonyms and Wavering, unstable, vacillating, fluctuating, fitful.n. That which is variable; that which varies, or is subject or liable to vary or change.n. In mathematics, a quantity which is indeterminate, and is considered with reference to its different possible values; originally, a quantity capable of values continuously connected in one dimension, so that it could be conceived as running through them all in the course of time.n. A shifting wind, as opposed to a trade-wind; hence, the variables, the intermediate region or belt between the northeast and the southeast trade-winds.