
I find the CONCEPT of coitus ridiculous
and off-putting.
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

with the CONCEPT
that time is an illusion.
The Big Bang Theory Season 12, Episode 19

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

Do you understand
the CONCEPT of blackmail?
The Big Bang Theory Season 1, Episode 16