Meaning of “composition” - Learner’s Dictionary

composition

noun uk us /ˌkɒmpəˈzɪʃən/
PARTS [ U ]

the parts, substances, etc that something consists of:

the composition of the atmosphere
MUSIC [ C ]

B2 a piece of music that someone has written:

The children played their own compositions in the concert.
WRITING MUSIC [ U ]

the process or skill of writing music:

He taught composition at Yale.
WRITING [ C, U ]

B1 a short piece of writing about a particular subject, done by a student

ARRANGEMENT [ U ]

the way that people or things are arranged in a painting or photograph

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