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English to English noun
| 1 |
someone devoted to the promotion of human welfare and to social reforms |  | source: wordnet30
| 2 |
a component that is added to something to improve it |  | Example: the addition of a bathroom was a major improvement the addition of cinnamon improved the flavor
source: wordnet30
| 3 |
One who, or that which, improves. |  | source: webster1913
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