There's an economic CONCEPT
known as a "positional good"...
The Big Bang Theory Season 3, Episode 15
It's proof of CONCEPT.
The Big Bang Theory Season 9, Episode 24
is an abstract CONCEPT...
Game of Thrones Season 1, Episode 6
I find the CONCEPT of coitus ridiculous
The Big Bang Theory Season 6, Episode 20
You must have heard
of that CONCEPT, haven’t you, miss?
Money Heist Season 1, Episode 11