noun
Refers to a complete set of matching items, such as clothes, dishes, or tools. Often used when items are designed to be used together.
新しいスーツを一揃い買った。
I bought a new suit (one set of matching jacket and trousers).
この茶碗は一揃いで売っています。
These teacups are sold as a set.
Compound of 一 (ひと, 'one') + 揃い (そろい, 'set, matching'), the noun form of 揃う (そろう, 'to be complete, to be in order').