自然数集 zìránshùjí set of natural numbers Origin Definitions Defs Strokes Stroke Words Sentences Sents 自然数 自然數 zìránshù noun natural number The set of non-negative integers including zero and the positive integers (0, 1, 2, 3...); sometimes specifically used to refer only to positive integers starting from 1.集 jí noun [set] (abbreviation) a set of items with common properties in mathematics; short for 集合 jíhé