also: ばんりょ
noun
A somewhat formal or literary term for a life partner, spouse, or close companion. Often used in contexts like marriage, lifelong partnership, or poetic descriptions of a companion.
彼女は人生の伴侶として最適な人だ。
She is the ideal person as a life partner.
結婚式で、二人は永遠の伴侶となることを誓った。
At the wedding, they vowed to become eternal companions.