In Spanish, the word for A, an is Un. This word often comes up when talking about ownership. It can be used as noun. It is classified as a A1 word, and is the 6th most commonly used word in Spanish. You can find example sentences below to provide context, and you can also listen to the word's pronunciation. Download our app to practice this and the other 3000 most common Spanish words with over 60000 example sentences, pronunciations, and various practice types.