Definition of on base
: occupying one of the bases (first, second, or third) during a game There's a runner on base.
Word by Word Definitions
: the lower part of a wall, pier, or column considered as a separate architectural feature
: the lower part of a complete architectural design (as of a monument)
: the bottom of something considered as its support : foundation
: of little height
: low in place or position
Seen and Heard
What made you want to look up on base? Please tell us where you read or heard it (including the quote, if possible).