Something which is added or summed.

(mathematical analysis) Of an infinite series: such that the sum of the absolute values of its summands converges.

(Britain) daylight saving time

plural of summand

plural of summary

(Britain) A form of daylight-saving time, one hour ahead of UTC, used in the United Kingdom. Abbreviation: BST

(grammar) A plurale tantum.

The holding of a summit (conference) or summits generally / Participation in a summit

plural of summa

plural of summa