一天 yītiān one day Definitions Defs Origin Strokes Stroke Words Sentences Sents yītiān one day · some day 一 yī numeral one one; the number 1; single; alone天 tiān noun day a period of twenty-four hours; also used as a measurement for days or a specific time of dayyītiān all day long 一 yī numeral whole whole; entire; throughout; all天 tiān noun day a period of twenty-four hours; also used as a measurement for days or a specific time of dayyītiān a sky full of 一 yī numeral whole whole; entire; throughout; all天 tiān noun sky sky; heavens; the space above the earth