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"Veinte" is an adjective which is often translated as "twenty", and "a las dos" is a phrase which is often translated as "at two". Learn more about the difference between "veinte" and "a las dos" below.
veinte(
beyn
-
teh
)An adjective is a word that describes a noun (e.g., the big dog).
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (number)
b. twentieth (in dates)
El veinte del mes que viene me voy a España.I'm going to Spain on the twentieth of next month.
a las dos(
ah
lahs
dohs
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. at two
La gente en España suele almorzar a las dos o a las tres.People in Spain have lunch at two or three.
b. at two o'clock
Su tren sale a las dos del andén número 12.Your train leaves from platform 12 at two o'clock.