Definition of Delian League in US English:

Delian League

proper noun

  • An alliance of ancient Greek city states, dominated by Athens, that joined in 478–447 BC against the Persians. The league was disbanded on the defeat of Athens in the Peloponnesian War (404 BC), but again united under Athens' leadership against Spartan aggression in 377–338 BC.

    Also called the Athenian empire