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1. Something designed or intended for use in conjunction with another.
2. Computers See plug-in.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a component, as an expansion card or chip, added to a computer to expand its capabilities.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||add-in - a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities|
PC board - a removable circuit board for a personal computer; fits into a slot in the mother board
printed circuit - computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered
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