Summing

Verb

1. Present participle of sum

Full definition of summing

Noun

1. The act or result of addition; a sum.
• 1815, John Dougall, The Young Man's Best Companion and Guide to Useful KnowledgeIn this manner each page accounts is summed up, and ... the amount of the last page of all, as comprehending all the particular summings of the preceding pages, is to be considered as the total amount of the whole account.