Definition of opposite number in English English dictionary
A person who holds a position in an organization that corresponds to that held by another person in an other organization; a counterpart
Your opposite number is a person who has the same job or rank as you, but works in a different department, firm, or organization. The French Defence Minister is to visit Japan later this month for talks with his Japanese opposite number = counterpart. A person who holds a position in an organization or system corresponding to that of a person in another organization or system; a counterpart: "had a face-to-face... conference with his opposite number at the American Embassy" (Frederick Forsyth)