一分 combines the number 一 with the classifier 分, which serves as a unit for currency (cents), time (minutes), scores, and abstract quantities meaning 'a small amount'. It often appears in fixed phrases like 一分钱一分货 (you get what you pay for). In natural speech, 一 is usually pronounced in the fourth tone (yì) before first-tone 分, though the dictionary form is yī fēn.