[u]

1. numeral One.

2. indefinite article determiner, masculine singular A, an.

Spelling (1-2): Before words beginning with a vowel or h-, it turns into ũn’, with word ligature (both words are written together without intermediate spaces). For feminine singular: una, or un’ before words beginning with a vowel or h-; for masculine plural, ũns; feminine plural: unas.

Etymology: From Latin unus.