連(つ)れ合(あ)い

Etymology: From 連(つ)れ合(あ)う 'to accompany each other.' Literally 'companion.'

Register: Neutral and somewhat old-fashioned — favoured by older speakers about their own spouse. It becomes respectful with the honorific prefix お: お連(つ)れ合(あ)い is a polite way to refer to someone else's spouse. For the strictly formal, documentary term, see 配偶者(はいぐうしゃ).

Nuance: A warm, traditional term that emphasizes the companionship aspect of marriage. Gender-neutral, making it useful when the speaker doesn't want to specify husband or wife.

Contrast with other terms

• 夫(おっと) / 妻(つま) — formal for own spouse (documents, etc.)
• 旦那(だんな) / 奥(おく)さん — common colloquial terms
• 主人(しゅじん) / 家内(かない) — traditional, becoming less common
• パートナー — modern, gender-neutral loanword