## Etymology
From Medieval Latin summatio ('a summing up'), from Latin summatus, past participle of summare ('to add up'), from summa ('sum, total, highest').

## AI Etymology
Summation comes from Medieval Latin summatio ('a summing up'), from Latin summatus, past participle of summare ('to add up'), from summa ('sum, total, highest'). The historical chain includes Latin summatio and Latin summa. The quoted older senses, "a summing up", "to add up", and "sum, total, highest", supply the semantic anchors for summation. The formation is best read as participial and borrowed: the word summation carries its older form-history into a compact English lexical shape. In present English it is used as a noun, "the process of adding things together; a concluding summary". English derivatives include summational; related English forms include sum, summate, and summative. The result is a noun whose etymology preserves both the older form and the later English specialization.

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- Cause, Change & Process
- Word Formation & Derivatives

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