Quick answer
"Just" is an adjective which is often translated as "justo", and "only one" is a noun which is often translated as "el único". Learn more about the difference between "just" and "only one" below.
just(
juhst
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (fair)
a. justo
We are defending a just cause here.Estamos defendiendo una causa justa.
2. (deserved)
a. merecido
It was a just punishment for his crimes.Fue un merecido castigo por sus crímenes.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
3. (recently)
a. acabar de
I just washed the dishes and now I have to take out the trash.Acabo de lavar los platos y ahora me toca sacar la basura.
b. justo
I was just arriving when she left.Justo estaba llegando cuando ella se marchó.
c. ahora mismo
I was just deciding what to do.Ahora mismo estaba decidiendo qué hacer.
4. (barely)
a. justo
I made it to the station just before the train left.Llegué a la estación justo antes de partir el tren.
b. por poco
You just missed him. He'll be back after lunch.Te lo perdiste por poco. Regresará después del almuerzo.
5. (exactly)
a. justo
Our new house is just what I wanted.Nuestra nueva casa es justo lo que quería.
6. (only)
a. solo
Don't be angry; I was just asking.No te enfades, solo estaba preguntando.
b. solamente
I've been to New York just once.He estado en Nueva York solamente una vez.
c. nomás
Regionalism used in Latin America: all the countries in South America, Central America, and the Caribbean. Does not include Spain.
(Latin America)
He came late just to annoy me.Vino tarde para fastidiarme nomás.
7. (equally)
a. tan
My new computer is just as good as yours.Mi computadora nueva es tan buena como la tuya.
8. (emphatic)
a. verdaderamente
The new models are just amazing.Los nuevos modelos son verdaderamente asombrosos.
9. (simply)
a. sencillamente
It was just the best movie I've seen in years.Sencillamente fue la mejor película que he visto en años.
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only one
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
1. (person or thing alone in a category)
a. el único
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(masculine)
You're the only one I told my secret to.Eres el único a quien dije mi secreto.
b. la única
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(feminine)
My sister is the only one still in Ecuador.Mi hermana es la única que permanece en Ecuador.
2. (best person or thing)
a. el único
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(masculine)
If you want to go to an Italian restaurant, Piero's is the only one.Si quieres ir a un restaurante italiano, Piero's es el único.
b. la única
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(feminine)
I've searched forever for the perfect white T-shirt, and this is the only one.He buscado la camiseta blanca perfecta por una eternidad, y ésta es la única.
An adjective is a word that describes a noun (e.g. the big dog).
3. (no more than one)
a. sólo un (masculine)
Let's get only one appetizer.Pedimos sólo un aperitivo.
b. sólo una (feminine)
Only one artwork will win the contest.Sólo una obra de arte va a ganar el concurso.
c. solamente un (masculine)
It was only one kiss. It's not a big deal.Fue solamente un beso. No es importante.
d. solamente una (feminine)
Professor Wilson is teaching only one class this semester.Profesor Wilson va a enseñar solamente una clase este semestre.
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