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"A las seis" is a phrase which is often translated as "at six", and "cuarto" is an adjective which is often translated as "fourth". Learn more about the difference between "a las seis" and "cuarto" below.
a las seis(
ah
lahs
seys
)A phrase is a group of words commonly used together (e.g., once upon a time).
b. at six o'clock
Emilio y Clara habían quedado en verse a las seis en la puerta de la estación de autobuses.Emilio and Clara had arranged to meet at six o'clock at the bus station's main door.
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).