"Once" is an adverb which is often translated as "una vez", and "UNO" is an abbreviation which is often translated as "ONU". Learn more about the difference between "once" and "UNO" below.
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An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (on one occasion)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (one occasion)
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
I decided to agree to it this once.Decidí permitirlo solo por esta vez.
I only saw him the once.Solo lo vi una vez.