The overall total; the sum of everything. Can be used as a noun or in expressions like 'to total' (総計する).
参加者は総計で120人に達した。
The participants reached a total of 120 people.
各項目を総計すると支出は予算を超えていた。
When all items were totaled, the expenditure exceeded the budget.
売上は四半期ごとにまとめ、年の総計を出す。
Sales are compiled each quarter, and the total for the year is calculated.