nullify - invalidate, extinguish⏎
nominate - suggest, choose, select⏎
official - formal, authoritative, genuine, businesslike, authorised, authorized⏎
progress - develop, go forward, improve, improvement⏎
operation - business, activity, undertaking⏎
refer - describe, indicate, speak about⏎
quasi - almost, partly, similar⏎
precise - exact, accurate, definite⏎
priceless - extremely valuable, important, very precious⏎