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addition

ad·di·tion [ ə dísh'n ] (plural ad·di·tions)


noun 
Definition:
 
1. putting in or on: the act of adding something onto or into something else

2. added person or thing: somebody or something that is added

3. mathematics calculation: the process of calculating the sum of two or more numbers or amounts

4. buildings annex: a part added to a building

5. chemistry chemical reaction: a chemical reaction in which two or more compounds combine to produce a new compound
an addition-type reaction

[14th century. Directly or via French< Latin addition-< additus, past participle of addere (see add)]

in addition 

1. 
used to introduce an additional point or relevant fact
 

2. 
also


in addition to as well as

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