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"Cuarto" is an adjective which is often translated as "fourth", and "a las once" is a phrase which is often translated as "at eleven". Learn more about the difference between "cuarto" and "a las once" below.
cuarto, el cuarto(
kwahr
-
toh
)An adjective is a word that describes a noun (e.g., the big dog).
a. fourth
Entra al edificio y toma el ascensor al cuarto piso.Enter the building and take the elevator to the fourth floor.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a las once(
ah
lahs
ohn
-
seh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. at eleven
A las once tengo cita con el dentista.I have an appointment with the dentist at eleven.
b. at eleven o'clock
No olvides que a las once tenemos una videoconferencia con nuestro cliente de Nueva York.Don't forget we have a videoconference with our New York client at eleven o'clock.