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Compositionality

It has property of productivity.

the vocabulary of any language can be used to build a infinite number of sentences

The meaning is compositional.

the meanings of the sentences are made up of the meanings of their lexemes

Not all

word combinations are compositional

An important category of non-compositional phrases is idioms.

distinction between the meanings of words and sentences

There are two main divisions

Lexical semantics

Phrasal semantics.

is studying the meaning of words

is the study of the construction of the meaning of phrases and sentences

from compositional combinations of

lexemes.