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pep (n.)

"vigor, energy," 1912, shortened form of pepper (n.), which was used in the figurative sense of "spirit, energy" from at least 1847. Pep rally "meeting to inspire enthusiasm" is attested from 1915; pep talk is from 1926. To pep (something) up "fill or inspire with vigor or energy" is from 1925.

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Definitions of pep from WordNet

pep (n.)
liveliness and energy;
this tonic is guaranteed to give you more pep
Synonyms: peppiness / ginger
From wordnet.princeton.edu