Allied means united or joined together. If two countries are allied, they are on the same side and have common interests.

When two people are allied, they are friendly — or at least cooperative. To be allied means to have an agreement to work together, so when politicians are allied on a bill, they've pledged to join forces and unite for a common cause. In a war, allied countries are fighting on the same side. Allied comes from ally, which first meant "join in marriage," from the Latin root alligare, "bind to."

Definitions of allied
  1. adjective
    joined by treaty or agreement
    brought into agreement or cooperation on the side of a faction, party, or cause
  2. adjective
    united in a confederacy or league
    synonyms: confederate, confederative
    characterized by unity; being or joined into a single entity
  3. adjective
    related by common characteristics or ancestry
    allied species”
    allied studies”
    connected by kinship, common origin, or marriage
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