noun
one win; one victory
Used in sports, games, or competitions to count a single win. Often appears in records like 一勝一敗 (one win, one loss).
彼は今シーズンまだ一勝しかしていない。
He has only one win so far this season.
チームは一勝一敗で五分の成績だ。
The team has a .500 record with one win and one loss.
勝利 is a general word for 'victory', while 一勝 specifically counts one win.
一敗 means 'one loss', often paired with 一勝 in win-loss records.
Compound of 一 (one) and 勝 (win/victory). The reading いっしょう follows regular rendaku-like gemination before 勝.