1º_ Odd number or quantity ("which is not divisible by 2") . See pair . 2º_ It is an ancient form for the adverb of negation no, which by its origin is still seen in Latin locutions. 3º_ 'NON' is the IATA code for Nonouti Airport, in Kiribati (Oceania).
Means uneven, without a partner, just, odd. Unequal, disparate.