rational numberWiktionary 原文构词拆分rational词根/词干+number词根/词干演变路径（由近及远）英语源自 ←拉丁语 rationalis词源说明From rational + number, ultimately from Latin rationalis + numerus. Compare analogous logarithm, from Ancient Greek.释义（英文）名词 Noun(mathematics) A number that can be expressed as the ratio of two integers.