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Definition of Close support

Close support Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) That action of the supporting force against targets or objectives which are sufficiently near the supported force as to require detailed integration or coordination of the supporting action with the fire, movement, or other actions of the supported force. See also direct support; general support; mutual support; support.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Close support Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. close-in firing by one unit against an enemy engaged by another unit
(hypernym) support, reinforcement, reenforcement