Term like "take the knee” in 2017 or "perestroika” in 1986 (9)

I believe the answer is:

neologism

(Other definitions for neologism that I've seen before include "Newly-coined word or expression" , "coinage" , "Newly coined word" , "New word or phrase" , "new term" .)

I've seen this clue in The Times.

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