Definition -
(1) Using more words than you need to express an idea.
(2) (rare) Adding a superfluous (or apparently superfluous) letter or syllable to a word.
Note: Some types of this are prothesis, epenthesis, and paragoge.

Example -
I smelled it with my nose.

Etymology -
The word derives via Late Latin from the Greek pleonasein, to be more than enough (from pleon, more).

Oxford English Dictionary -
Its first citation is from 1586:
"Pleonasmus, where, with words seeming superfluous, we doe increase our reasons, as thus, With these eares I heard him speake it."
(A. Day Eng. Secretary ii. (1625) 82)

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