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### Definitions from Wordnet 2.0

• 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"
• 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"
• a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor"
• a suburban area laid out in streets and lots for a future residential area
• something added to what you already have; "the librarian shelved the new accessions"; "he was a new addition to the staff"
• 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"

### Definitions from Wiktionary

• 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" ,
• 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" ,
• 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" ,
• something added to what you already have; "the librarian shelved the new accessions"; "he was a new addition to the staff" ,
• a suburban area laid out in streets and lots for a future residential area ,
• 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"

### Addition Meaning and Definition in Wikipedia

Addition is the mathematical way of putting things together.

In arithmetic, addition is finding the total of two or more numbers. The sign for addition is "+". The name for the sign "+" is "plus". Another name for the total is the sum.

### 'Addition' example sentence in quotations

* There comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones. - Conan Doyle

* It must require an inordinate share of vanity and presumption, too, after enjoying so much that is good and beautiful on earth, to ask the Lord for immortality in addition to all. - Heinrich Heine

* Modern Man is the victim of the very instruments he values most. Every gain in power, every mastery of natural forces, every scientific addition to knowledge, has proved potentially dangerous, because it has not been accompanied by equal gains in self-understanding and self-discipline. - Lewis Mumford