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QUICK ANSWER
"Casilleros" is a form of "casillero", a noun which is often translated as "pigeonholes". "Buzón" is a noun which is often translated as "mailbox". Learn more about the difference between "casilleros" and "buzón" below.
el casillero(
kah
-
see
-
yeh
-
roh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. pigeonholes (with open compartments)
La secretaria coloca la correspondencia en el casillero de profesores.The secretary leaves any correspondence in the staff pigeonholes.
b. set of pigeonholes (with open compartments)
Detrás del recepcionista había un casillero lleno de llaves.Behind the receptionist, there was a set of pigeonholes full of keys.
c. lockers (with lockable compartments)
El casillero del instituto se usa para dejar los libros.The lockers at the high school are used for leaving books in.
d. set of lockers (with lockable compartments)
Este casillero sería perfecto para el vestuario.This set of lockers would be perfect for the locker room.
a. pigeonhole (open)
La carta que encontré en mi casillero era anónima.The letter I found in my pigeonhole was anonymous.
3. (sports)
a. scoreboard
En el casillero del estadio San Siro sigue registrándose un empate sin goles.It's still a goalless draw on the scoreboard of the San Siro stadium.
a. box
Hay que marcar con una X los casilleros que te correspondan.You need to put an X in the boxes that apply to you.
el buzón(
boo
-
sohn
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. mailbox (United States)
Regionalism used in the United States
Siempre me olvido de mirar si hay cartas en el buzón.I always forget to check if there are letters in the mailbox.
b. letterbox (of a home or business) (United Kingdom)
Regionalism used in the United Kingdom
Como no vi un buzón, metí la carta por debajo de la puerta.I didn't see a letterbox, so I slipped the letter under the door.
c. postbox (on the street) (United Kingdom)
Regionalism used in the United Kingdom
Todos los buzones de esta ciudad son rojos.In this city, all the postboxes are red.
2. (computing)
a. mailbox
Tengo demasiados correos sin leer en mi buzón.I have too many unread e-mails in my mailbox.