Meaning of “the” - Learner’s Dictionary

the

determiner uk us strong /ðiː/ weak /ði, ðə/
ALREADY KNOWN

A1 used before nouns to refer to particular things or people that have already been talked about or are already known:

Can you pass the salt?
I'll pick you up at the station.
That's the new restaurant I told you about.
ONLY ONE

A1 used before nouns when only one of something exists:

Have you seen the Eiffel Tower?
I'd love to travel round the world.
SINGULAR NOUN

used before a singular noun to refer to all the things or people described by that noun:

The tiger has become extinct in many countries.
ADJECTIVE

used before some adjectives to make them into nouns:

a home for the elderly
COMPARE

B2 used before each of two adjectives or adverbs to show how one thing changes depending on another:

The longer we live here, the more we like it.
EACH

used with units or measurements to mean each or every:

How many US dollars to the pound?
BODY

B1 used when referring to a part of the body:

He held her tightly by the arm.
TIME

B2 used before numbers that refer to dates or periods of time:

the sixties
Thursday the 29th of April
MUSIC

used with the names of musical instruments or dances to mean the type of instrument or dance in general:

Can you play the violin?

(Definition of “the” from the Cambridge Learner’s Dictionary © Cambridge University Press)