Definition - A word that either increases or decreases the intensity of another word.

Example -
The very in very tall and the hardly in hardly ever.

Etymology -
The word derives from the Latin intensus, stretched or strained

Oxford English Dictionary -
Its first citation in this sense is from 1931:
"Intensifiers used ironically instead of down-toners. ‘A lot you know about that!’"
(G. Stern Meaning & Change of Meaning 338 )

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