Definition of philander
: to have casual or illicit sex with a person or with many people
especially
: to be sexually unfaithful to one's spouse
—usually used of a man … her philandering brother-in-law; and … the schoolteacher he philanders with. — Judith Crist
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Merriam-Webster unabridged
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Time Traveler for philander
The first known use of philander was in 1737
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