Definition of 自然数 (しぜんすう)
しぜんすう
                        自然数
しぜんすう
shizensuu
noun
•
        
natural number, nonnegative integer(mathematics)
Related Kanji
| 自 | oneself | 
| 然 | sort of thing, so, if so, in that case, well | 
| 数 | number, strength, fate, law, figures |