noun
General term for any competitive tournament, including round-robin and knockout formats.
来月、テニスのトーナメントに出場する。
I will participate in a tennis tournament next month.
noun
knockout tournament; elimination tournament
Specifically refers to a single-elimination or knockout-style tournament, where losing once means elimination.
このトーナメントは負けたら終わりの一発勝負だ。
This tournament is a single-elimination format where you're out if you lose.