Variable
来自Big Physics
late Middle English: via Old French from Latin variabilis, from variare (see vary).
wiktionary
Borrowed into Middle English in the 14th century from Old French variable, from Latin variare(“to change”), from varius(“different, various”).
etymonline
variable (adj.)
late 14c., of persons, "apt to change, fickle," from Old French variable "various, changeable, fickle," from Late Latin variabilis "changeable," from variare "to change" (see vary). Of weather, seasons, etc., attested from late 15c.; of stars, from 1788.
variable (n.)
"quantity that can vary in value," 1816, from variable (adj.) in mathematical sense of "quantitatively indeterminate" (1710). Related: Variably; variability.
