一(A壹) [yī] one, a little; 第一 dì-yī first, primary; 看一看 kànyīkàn have a (quick) look at
[yí] (used before tone #4); 一个人 yí gè rén one person; 一定 yídìng certain; 一样 yíyàng same; 一月yíyuè January
[yì] (used before tones #2 and #3); 一点儿 yìdiǎnr a little; 一些 yìxiē some
[Compare with 幺(F么) yāo, which also means “one”}