加起來變成一個
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total · noun
The total you get when two or more numbers or amounts are added together.
總和
You can think of summation as the moment when many separate things are pushed together into one. A column of numbers becomes a single total; an hour of talk becomes one short paragraph at the end. Either way the picture is many-into-one, done once everything is in.
summation 可以想成「等東西都齊了，再把它們合成一個」。一排數字加起來，變成一個總數。一小時的討論收攏起來，變成最後那一段話。兩件事看起來差很遠，動作卻是同一個：把散開的東西併成一份。
From the word’s history
Wiktionary gives the word as sum + -ation, that is, the doing of summing.
來源資料把這個字拆成 sum（總和）加 -ation（把動作變成名詞），字面上就是「加總這件事」，正好對上它兩種用法底下的同一個動作。
Wiktionary, "summation"
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