single; base hit; one-base hit
Baseball term for a hit that allows the batter to reach first base safely.
He hit a single to left field in the first inning.
The team recorded five singles in this game.
単打 is a single (one-base hit), while 二塁打 is a double (two-base hit); the similar 〜打 naming makes them easy to mix up.
安打 is the general term for any safe hit, whereas 単打 refers specifically to a one-base hit (a single).
単打 is a single (one-base hit), while 三塁打 is a triple (three-base hit), so the two terms describe hits of very different value despite both being types of 安打.
Compound of 単 (single) and 打 (hit), a straightforward baseball term.