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addition [additions]▼(arithmetic: process of adding)noun[UK: ə.ˈdɪʃ.n̩] [US: ə.ˈdɪʃ.n̩]
summation [summations]▼(mathematics: an adding up of a series of items)noun[UK: sə.ˈmeɪʃ.n̩] [US: sə.ˈmeɪʃ.n̩]
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