Webster's English Dictionary

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equation

equa.tion \i-'kwa--zh*n, -sh*n\ n 1a: the act or process of equating  1b1: 
   an element affecting a process : FACTOR  1b2: a complex of variable factors 
    1c: a state of being equated; specif : a state of association or id 
   entification of two or more things 2a: a usu. formal statement of the 
   equality or equivalence of mathematical  or logical expressions 2b: an 
   expression representing a chemical reaction quantitatively by means  of 
   chemical symbols placed on the left for reacting substances and on the 
   right for products of the sign > or = or of the sign <double-arrows> or 
   <double-half-arrows> if the reaction is reversible