not only, as well as
彼は英語のみならずフランス語も話すことができる。
He can speak not only English but also French.
社員のみならず考え方の多様性です
It’s not just diversity among employees, but diversity of thought as well.
— ブゴニア (2025)
時は虚偽のみならず真実も明らかにする。
Time reveals not only falsehoods but also the truth.
彼女のみならず彼女の息子達も幸せだった。
Not only she but also her sons were happy.