love affair
US /ˈlʌv əˌfer/
UK /ˈlʌv əˌfer/
1.
a romantic or sexual relationship between two people who are not married to each other
:
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He had a secret love affair with his colleague.
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Their love affair lasted for several years before they broke up.
2.
a strong enthusiasm or passion for something
:
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She developed a love affair with classical music.
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His love affair with painting began in his youth.