(n.) The act of summing, or forming a sum, or total amount; also, an aggregate.

abbreviation abridgment abstract account accounts addend aggregate amount apocope argument body count box score capitulation cast census compression condensation conspectus core count curtailment difference elision ellipsis epitome essence evidence foreshortening gist head count inventory main point meat nose count number pith plus plus sign precis product quantity recap recapitulation reckoning recount recounting reduction rehearsal repertory resume retrenchment run-through rundown score shortening statement substance subtotal sum sum and substance summary summing summing up summing-up syncope synopsis tale tally telescoping testimony the bottom line the story the whole story total truncation whole x number