[pre.ci.sion] n (1740) 1: the quality or state of being precise: exactness
2. a: the degree of refinement with which an operation is performed or a measurement stated--compare accuracy 2b b: the accuracy (as in binary or decimal places) with which a number can be represented usu. expressed in terms of the number of computer words available for representation "double ~ arithmetic permits the representation of an expression by two computer words"
3: relevance
2. -- pre.ci.sion.ist n
[2]precision adj (1875) 1: adapted for extremely accurate measurement or operation
2: held to low tolerance in manufacture
3: marked by precision of execution