第四纪 dìsìjì Quaternary Period Definitions Defs Origin Strokes Stroke Words Sentences Sents 第 dì affix [ordinal] Prefix used before a number or the question word 几 jǐ to form an ordinal number indicating sequence or rank四 sì numeral fourth the fourth in a sequence or rank纪 紀 jì noun era (bound form) a period of time, such as a twelve-year cycle, a geological period, or a century; era
