
There's an economic CONCEPT
known as a "positional good"...
The Big Bang Theory Season 3, Episode 15

You must have heard
of that CONCEPT, haven’t you, miss?
Money Heist Season 1, Episode 11

I find the CONCEPT of coitus ridiculous
and off-putting.
The Big Bang Theory Season 6, Episode 20

so the CONCEPT of a bastard
doesn't exist.
Game of Thrones Season 7, Episode 4

It's proof of CONCEPT.
The Big Bang Theory Season 9, Episode 24