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Synonyms
ad·di·tion (ə-dĭsh́ən)

[Middle English, from Old French, from Latin additiō, additiōn-, from additus past participle of addere, to add; see add.]

noun 

  1. The act or process of adding, especially the process of computing with sets of numbers so as to find their sum.
  2. Something added, such as a room or section appended to a building.

idioms

in addition
Also; as well.
in addition to
Over and above; besides.

derivatives

ad·dítion·al
adjective
ad·dítion·al·ly
adverb