Webster's English Dictionary

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addition

ad.di.tion \*-'dish-*n\ n [ME, fr. MF, fr. L addition-, additio, fr. 
   additus, pp. of Xaddere 1: the result of adding : INCREASE  2: the act or 
   process of adding  3: the operation of combining numbers so as to obtain an 
   equivalent simple quantity 4: a part added (as to a building or 
   residential section)  5: direct chemical combination of substances into a 
   single product