Simple Definition of pre-
: earlier than : before
: in advance
Full Definition of pre-
1 a (1) : earlier than : prior to : before <Precambrian> <prehistoric> (2) : preparatory or prerequisite to <premedical> b : in advance : beforehand <precancel> <prepay>
2 : in front of : anterior to <preaxial> <premolar>
Seen and Heard
What made you want to look up pre-? Please tell us where you read or heard it (including the quote, if possible).