adj

• (loosely) Both exact and accurate.
  "A memory is "precise" when the occurrences that would verify it are narrowly circumscribed: for instance, "I met Jones" is precise as compared to "I met a man." A memory is "accurate" when it is both precise and true, i.e. in the above instance, if it was Jones I met."
• (sciences, engineering, of data points, strictly) Consistent, clustered close together, agreeing with each other (this does not mean that they cluster near the true, correct, or accurate value).

verb

• (nonstandard, European Union documents, transitive) To make or render precise; to specify.
  "This proposal for a new basic regulation is justified because there is a need to precise the objectives of the CFP."