The simplest definition of Linguistics is that it’s the science of
language.

https://open.umn.edu/opentextbooks/textbooks/599

__

Linguistics is the scientific study of language.[1][2] It entails the comprehensive, systematic, objective, and precise analysis of all aspects of language[3] — cognitive, social, environmental, biological as well as structural.[4]

https://en.wikipedia.org/wiki/Linguistics