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v. add·ed, add·ing, adds
1. To join or combine (numbers) through addition: If you add 5 and 10 and 17, the result is 32. If you add 6 to 8, you get 14.
2. To join or unite so as to increase in size, quantity, quality, or scope: added 12 inches to the deck; flowers that added beauty to the dinner table.
3. To say or write further.
1. To find a sum in arithmetic.
a. To constitute an addition: an exploit that will add to her reputation.
b. To create or make an addition: gradually added to my meager savings.
1. To be reasonable, plausible, or consistent; make sense: The witness's testimony simply did not add up.
2. To amount to an expected total: a bill that didn't add up.
3. To formulate an opinion of: added up the other competitors in one glance.
add up to
To constitute; amount to: The revisions added up to a lot of work.
[Middle English adden, from Latin addere : ad-, ad- + dare, to give; see dō- in Indo-European roots.]
add′a·ble, add′i·ble adj.
attention deficit disorder
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.
in a state where addition is possible
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014