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Noun: theater of operations
Usage: US (elsewhere: theatre of operations)
  1. (military) a region in which active military operations are in progress
    "the army was in the theater of operations awaiting action";
    - field, field of operations, theater [US], theatre, theatre of operations

Derived forms: theaters of operations

Type of: region

Part of: theater of war [US], theatre of war

Encyclopedia: Theater of operations