Webster's English Dictionary

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variable

1. vari.able \'ver-e--*-b*l, 'var-\ \-ble-\ aj 1a: able or apt to vary : 
   CHANGEABLE {~ winds}  1b: FICKLE, INCONSTANT  2: characterized by 
   variations  3: having the characteristics of a variable  4: not true to 
   type : ABERRANT - used of a biological group or c haracter - vari.able.ness 
   n
2. variable n 1: something that is variable  2a: a quantity that may assume 
   any one of a set of values  2b: a symbol representing a variable