Nuptial is a formal adjective meaning “about a wedding” or “about getting married.” You meet it in nuptial Mass, nuptial blessing, nuptial agreement, nuptial vows — church, law, and rather elevated writing.

Nuptial是 a formal adjective一個正式的形容詞，meaning "about a wedding" or "about getting married."意思是「跟婚禮有關」或「跟結婚有關」。You meet it你會在 in nuptial Mass像nuptial Mass婚禮彌撒、nuptial blessing結婚祝禱、nuptial agreement婚前協議、nuptial vows結婚誓詞裡看到它——church, law, and rather elevated writing出現在教會、法律、還有相當文雅的書面用語裡。

Ordinary people say wedding or marriage instead: wedding dress, not nuptial dress, unless someone is being fancy or funny.

Ordinary people一般人 say wedding or marriage instead會改說wedding或marriage：wedding dress是wedding dress，not nuptial dress而不是nuptial dress，unless someone is being fancy or funny除非有人故意講得很花俏或搞笑。

Biologists also use nuptial in a dry, technical way (nuptial plumage, nuptial gift) for the colours or presents animals use when they pair.

Biologists生物學家 also use nuptial in a dry, technical way也會用nuptial這個字，用法乾巴巴、很技術性 nuptial plumage像nuptial plumage求偶羽色、nuptial gift或nuptial gift求偶禮物 for the colours or presents animals use when they pair指動物配對時用的顏色或禮物。

So the word is not slang, and it is not the everyday word for “married life”; it points at the ceremony or the pairing, in a dressed-up or scientific voice.

So the word所以這個字 is not slang不是俚語，and it is not the everyday word for "married life"也不是「婚姻生活」的日常用語；it它指的是 points at the ceremony or the pairing婚禮儀式或配對這件事，in a dressed-up or scientific voice用的是一種盛裝打扮或科學性的語氣。