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English word addition comes from Latin addo, and later Old French (842-ca. 1400) adition (Addition (that which is added).)
addo (Latin)
I acquire.. I add.. I bring or add to; annex, augment.. I put, place, lay a person or thing to another.
additionis (Latin)
adition (Old French)
Addition (that which is added).
addition (English)
(heraldry) Something added to a coat of arms, as a mark of honour; opposed to abatement.. (legal) A title annexed to a person's name to identify him or her more precisely, as in "John Doe, Esq.", "Robert Dale, Mason", "Thomas Way, of New York".. (music) A dot at the right side of a note as an indication that its sound is to be lengthened one half.. (uncountable) The act of adding anything.. [...]