I think it's CULTURAL.
The Big Bang Theory Season 11, Episode 10
While you do provide
a certain CULTURAL diversity...
The Big Bang Theory Season 2, Episode 13
Yes, it tells us that you participate
in the mass CULTURAL delusion...
The Big Bang Theory Season 1, Episode 1
"An examination of the economic,
CULTURAL and political roots of slavery...
The Big Bang Theory Season 6, Episode 6
...the CULTURAL convention
is to bring them hot beverages.
The Big Bang Theory Season 1, Episode 6