The Italian indefinite article (l'articolo indeterminativo) corresponds to English a/an and is used with singular nouns. It also corresponds to the number one.
| uno zio (uncle) | una zia (aunt) |
| un cugino (cousin, m.) | una cugina (cousin, f.) |
| un amico (friend, m.) | un’amica (friend, f.) |
Uno is used for masculine words beginning with z or s + consonant; un is used for all other masculine words. Una is used for feminine words beginning with a consonant; un’ is used for feminine words beginning with a vowel.
un treno e una bicicletta
un aeroplano e un’automobile
uno stadio e una stazione