既男 is read as きだん (kidan) and means married man.
きだん
kidan
きこんだんせい
married man
すでに
already
きせい
established
きぞん
existing
ready-made
きせいふく
ready-made clothes
きてい
きせいじじつ
established fact
きとくけん
vested rights
きおうしょう
illness that one had in the past
きこん
married
きせつ