The definition of a paramour is a lover or romantic partner.
(noun)An example of paramour is the girlfriend of a married man.
See paramour in Webster's New World College Dictionary
noun
Origin: ME < par amur < OFr par amour, with love < par (L per), by + amour (L amor), love
See paramour in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English
Origin: , from par amour, by way of love, passionately
Origin: , from Anglo-Norman
Origin: : par, by (from Latin per; see per1 in Indo-European roots)
Origin: + amour, love (from Latin amor, from amāre, to love)
.Learn more about paramour