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Quick answer
"Una vez" is a phrase which is often translated as "once", and "mientras" is a conjunction which is often translated as "while". Learn more about the difference between "una vez" and "mientras" below.
una vez(
oo
-
nah
 
behs
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (one occasion)
a. once
Conozco a María porque coincidimos una vez en una fiesta.I know Maria because we once met at a party.
b. one time
Solo he ido a ese restaurante una vez desde que me mudé.I've only been to that restaurant one time since I moved.
2. (when)
a. once
Una vez finalizada la tarea, cierra el entorno de programación.Once the task is finished, close the programming environment.
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mientras(
myehn
-
trahs
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (at the same time)
a. while
Lavó los platos mientras yo dormía la siesta.He did the dishes while I took a nap.
2. (during the time that)
a. as long as (followed by verb in subjunctive)
Mientras trabaje aquí, nunca podré tomarme unas vacaciones en condiciones.As long as I work here, I'll never manage to take a proper vacation.
3. (if)
a. as long as (followed by verb in subjunctive)
Mientras termines los deberes a tiempo, me da igual que escuches música o no.As long as you finish your homework on time, I don't mind if you listen to music.
4. (in contrast with)
a. whereas
Mientras que a mi hermana le encanta leer, a su esposo le encanta trabajar en el jardín.Whereas my sister loves to read, her husband loves to garden.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
5. (at the same time)
a. meanwhile
Tu hermana va a recoger su cuarto. Mientras, tú puedes quitar el polvo del salón.Your sister is going to clean up her room. Meanwhile, you can dust the living room.
b. in the meantime
Saca al perro; mientras, puedo trapear el piso de la cocina. Take the dog out. I can mop the kitchen floor in the meantime.
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