(baseball) Having reached a base in an inning.
One run, two hits, one walk, no errors; two left on base.
Located within the premises of a military base.
(aviation) Flying the base leg of an approach.
The Piper was on base for a landing on runway 9.
A batter-runner who reaches first base without being put out (see below) is said to be safe and is now on base. Source: Internet
A hitless night with runners in scoring position and seven runners left on base is not a recipe for winning games. Source: Internet
Although it is a rare accomplishment, it is largely dependent on circumstances outside the player's control, such as his preceding teammates' ability to get on base, as well as the order in which he comes to bat in any particular inning. Source: Internet
An error by Danny Murphy scored Donlin and put Sam Mertes on base. Source: Internet
At the time, CDPR stated: “…We would like to start by apologizing to you for not showing the game on base last-gen consoles before it premiered and, in consequence, not allowing you to make a more informed decision about your purchase. Source: Internet
Also, because a ball is live when a base on balls occurs, runners on base forced to advance one base may attempt to advance beyond one base, at their own risk. Source: Internet