Noun
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the arithmetic operation of summing
calculating the sum of two or more numbers
"the summation of four and three gives seven"
"four plus three equals seven"
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a suburban area laid out in streets and lots for a future residential area
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something added to what you already have
"the librarian shelved the new accessions"
"he was a new addition to the staff"
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a quantity that is added
"there was an addition to property taxes this year"
"they recorded the cattle's gain in weight over a period of weeks"
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the act of adding one thing to another
"the addition of flowers created a pleasing effect"
"the addition of a leap day every four years"
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a component that is added to something to improve it
"the addition of a bathroom was a major improvement"
"the addition of cinnamon improved the flavor"
- add on