The process of adding things together or the total amount you get when you add things together.
From Latin 'summa' meaning 'sum or total', combined with the suffix '-ation' which indicates an action or process. The word entered English in the 14th century to describe the mathematical act of combining quantities.
Summation is the fancy term mathematicians use for simple addition, but it's also used in law when a lawyer summarizes their case—both meanings involve bringing separate parts together into one meaningful whole.
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