noun
A somewhat formal or literary term for a man who is married; not the most common everyday word (which is typically 既婚者 or 結婚している人).
彼は妻帯者だが、独身のように振る舞っている。
He is a married man, but he acts as if he were single.
Antonym: unmarried person, single person.
Compound of 妻帯 (saitai, 'being married', from 妻 'wife' and 帯 'to wear, carry') + 者 (sha, 'person').