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"Una" is a form of "una", a noun which is often translated as "one". "Libre" is a form of "libre", an adjective which is often translated as "free". Learn more about the difference between "una" and "libre" below.
la una(
oo
-
nah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (time)
libre(
lee
-
breh
)An adjective is a word that describes a noun (e.g., the big dog).
1. (at liberty)
a. free
Soy libre; puedo dormir hasta mediodía si quiero.I'm free; I can sleep until noon if I feel like it.
2. (time)
a. free
Esos libros son libres. Puedes llevarte los que quieras.Those books are free. You can take as many as you like.
