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Of, relating to, or being a musical instrument, arrangement, or performance that does not feature electronic amplification or modification; acoustic: "[His] fans will be pleased that more than half the cuts have the familiar sweetness, even when they include drums and a bit of snarling unplugged guitar” ( Jef Scoville).
(adjective)
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Without electronic amplification or modification; acoustically: performed unplugged in an intimate café.
(adverb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.