We found 2 dictionaries that define the word number 1's:

General (1 matching dictionary)

1. Number Number+++1's+++(Destiny's+++Child+++album)'s (Destiny's Child album), Number Number+++1's+++(Mariah+++Carey+++album)'s (Mariah Carey album), Number Number+++1's+++(Prince+++Royce+++album)'s (Prince Royce album), Number Number+++1's+++(video)'s (video), Number 1s: Wikipedia, the Free Encyclopedia

Slang (1 matching dictionary)

2. number number+++1's's: Urban Dictionary

(Note: See number_1 as well.)

Definitions from WordNet (number 1) ▸ noun:  the first element in a countable series ▸ Also see number_1 ▸ Words similar to number 1's ▸ Usage examples for number 1's ▸ Idioms related to number 1's ▸ Wikipedia articles (New!) ▸ Words that often appear near number 1's ▸ Rhymes of number 1's ▸ Invented words related to number 1's