— overachievement , n. — overachiever , n.
/oh'veuhr euh cheev"/ , v.i. , overachieved, overachieving .
1. to perform, esp. academically, above the potential indicated by tests of one's mental ability or aptitude.
2. to perform better or achieve more than expected, esp. by others.
[ 1950-55; OVER- + ACHIEVE, or by back formation from overachiever ]