Synonyms of affair in English:

affair


See definition of affair

noun

1‘what my mum does in her spare time is her affair’

SYNONYMS
business, concern, matter, responsibility, province, preserve, interest
problem, worry, lookout
informal pigeon, funeral, headache, baby, bailiwick

2affairs‘they aren't worried about their financial affairs’

SYNONYMS
transactions, concerns, matters, activities, dealings, undertakings, ventures, proceedings
business, field, sphere
informal goings-on, doings

3‘this is a truly shocking affair’

SYNONYMS
event, incident, happening, occurrence, phenomenon, eventuality, episode, interlude, circumstance, set of circumstances, adventure, experience, case, matter, business, thing
proceedings

4‘I heard there were to be fireworks—it'll be a grand affair’

SYNONYMS
party, celebration, function, reception, gathering, soirée, event, social event, occasion, social occasion
informal do, rave, bash, get-together, blowout
British informal rave-up, thrash, knees-up, beanfeast, beano, bunfight, jolly

5‘the director and his secretary were having an affair’

SYNONYMS
relationship, love affair, romance, fling, flirtation, dalliance, liaison, entanglement, romantic entanglement, involvement, attachment, affair of the heart, intrigue
relations
affaire, affaire de cœur, affaire du cœur, amour
informal hanky-panky
British informal carry-on