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one-tenth; one percent (one-tenth of a wari); 3 mm (one-tenth of a sun); 2.4 mm (one-tenth of a mon, a traditional unit used to measure shoe sizes); 0.1 degree (one-tenth of a do, used to measure body temperature on any temperature scale)
one-quarter of a ryō (obsolete unit of currency)
thickness
advantageous circumstances
one-tenth of a monme of silver
「分」 has other readings with different meanings.
勝負は五分五分といったところだ。
The match is about fifty-fifty.
成功する可能性は三分程度だ。
The chance of success is about 30%.
今日の試合、彼は七分の力で戦っている。
He is fighting at 70% of his strength.