A special experience of love; the sum of the incidents having to do with being in love with any person.(noun)
The Century Dictionary (Public Domain)
Use "love-affair" in a sentence
"Her cries and protests would give way to whimperings and wailings, while the men about laughed at the strangeness of the love-affair between her and the Irish terrier."
"My love-affair with Egyptology began in the summer of 1998 on an archaeological dig in Israel."
"I'm thinking about the time I was conducting family therapy at the local children's psychiatric hospital and outside my door the maintenance man was having a show-down with his work love-affair girlfriend who was confronting him."