Pronunciation: (er'ur),[key] —n. 1. a deviation from accuracy or correctness; a mistake, as in action or speech: His speech contained several factual errors. 2. belief in something untrue; the holding of mistaken opinions.
3. the condition of believing what is not true: in error about the date. 4. a moral offense; wrongdoing; sin.
5. Baseball.a misplay that enables a base runner to reach base safely or advance a base, or a batter to have a turn at bat prolonged, as the dropping of a ball batted in the air, the fumbling of a batted or thrown ball, or the throwing of a wild ball, but not including a passed ball or wild pitch.
6. Math.the difference between the observed or approximately determined value and the true value of a quantity.
7. Law. a. a mistake in a matter of fact or law in a case tried in a court of record.
b. See writ of error. 8. Philately.a stamp distinguished by an error or errors in design, engraving, selection of inks, or setting up of the printing apparatus. Cf. freak1 (def. 5), variety (def. 8).