せん
sen

Noun
no-Adjective

1. former; previous; old

その少年しょうねん先週せんしゅうまつ、野球やきゅうのボールでまどガラスをった。
sono shōnenwa senshūmatsu yakyūno bōrude madogarasuo watta.
The boy broke the window with a baseball last weekend.
Noun

2. first move (in go, shogi, etc.); opening move