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add (v.)

late 14c., "to join or unite (something to something else)," from Latin addere "add to, join, attach, place upon," literal and figurative, from ad "to" (see ad-) + -dere, combining form meaning "to put, place," from dare "to give" (from PIE root *do- "to give"). Intransitive meaning "to do sums, do addition" also is from late 14c. Related: Added; adding. To add up is from 1754; in the figurative meaning "make sense," 1942. Adding machine "machine to cast up large sums" is from 1822.

Origin and meaning of add

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Definitions of add from WordNet
1
add (v.)
make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of;
She added a personal note to her letter
We added two students to that dorm room
add (v.)
state or say further;
Synonyms: append / supply
add (v.)
bestow a quality on;
The music added a lot to the play
This adds a light note to the program
Synonyms: lend / impart / bestow / contribute / bring
add (v.)
make an addition by combining numbers;
Synonyms: add together
add (v.)
determine the sum of;
Synonyms: total / tot / tot up / sum / sum up / summate / tote up / add together / tally / add up
add (v.)
constitute an addition;
This paper will add to her reputation
2
add (n.)
a condition (mostly in boys) characterized by behavioral and learning disorders;
Synonyms: attention deficit disorder / attention deficit hyperactivity disorder / adhd / hyperkinetic syndrome / minimal brain dysfunction / minimal brain damage / mbd
From wordnet.princeton.edu