pre·ci·sion 
(prĭ-sĭzhən)
(prĭ-sĭzhən)n.
1. The state or quality of being precise; exactness.
2.
a. The ability of a measurement to be consistently reproduced.
b. The number of significant digits to which a value has been reliably measured.
adj.
1. Used or intended for accurate or exact measurement: a precision tool.
2. Made so as to vary minimally from a set standard: precision components.
3. Of or characterized by accurate action: precision bombing.
[Latin praecīsiō, praecīsiōn-, a cutting off, from praecīsus, past participle of praecīdere, to cut off; see PRECISE.]