定于 Traditional form: 定於 Pinyin (reading): dìngyú Definitions: set at scheduled at Characters: 定 - to decide, to fix, to settle; to order; definite, fixed, sure 于 - at, in, on; to, from; alas! Traditional characters: 定 - to decide, to fix, to settle; to order; definite, fixed, sure 於 - at, in, on; to, from; alas!