precision
Concise Oxford English Dictionary © 2008 Oxford University Press:
precision/prɪˈsɪʒn/
▶noun the quality, condition, or fact of being precise.
■ [as modifier] marked by or designed for accuracy and exactness: a precision instrument.
■ refinement in a measurement or specification, especially as represented by the number of digits given.
'precision' also found in these Oxford entries:

