Meaning of “concept” - Learner’s Dictionary

concept

noun [ C ] us uk /ˈkɒnsept/
an abstract conceptThe whole concept of democracy seems foreign to them.The concept of loyalty is completely foreign to him.It's a difficult concept to understand.He failed to understand the film's central concept.

B2 an idea or principle:

the concept of free speech

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