noun
ten percent; one-tenth
Used to express a proportion or fraction, especially in financial, statistical, or everyday contexts.
売り上げが前年より１割増えた。
Sales increased by ten percent compared to the previous year.
この商品は定価の１割引で買える。
You can buy this product at a ten percent discount.
割 is the counter for tenths; １割 means one-tenth, while 割 alone can mean proportion or ratio.
パーセント is the direct loanword for 'percent'; １割 is equivalent to 10パーセント, but 割 is more common in traditional Japanese contexts like discounts.
Compound of 一 (いち, 'one') and 割 (わり, 'tenth'). The counter 割 is used for tenths, so １割 literally means 'one tenth'.