Definitions from Wiktionary (addition)

▸ noun:  (uncountable) The act of adding anything.
▸ noun:  Anything that is added.
▸ noun:  (uncountable, arithmetic) The arithmetic operation of adding.
▸ noun:  (music) A dot at the right side of a note as an indication that its sound is to be lengthened one half.
▸ noun:  (chiefly law) A title annexed to a person's name to identify him or her more precisely.
▸ noun:  (heraldry) Something added to a coat of arms, as a mark of honour.
▸ noun:  (organic chemistry) an organic reaction where two or more molecules combine to form a larger one (the adduct).

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