Definition - A word or phrase that has an obvious meaning, but that also has an additional, less-well-known — perhaps esoteric — meaning.

Example -
It's an extremely hot summer day. A young man walking down a searing downtown sidewalk passes a very attractive woman dressed in a skin-tight, full-length black dress.
Him to her: You look hot in that outfit.
Her: I am hot.
Him (hoping it's adianoeta): I'm hot, too.
Her (it's not): You should go home and put on some cut-offs.

Etymology -
The word means "unintelligible" in Greek.

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