summation /sʌˈmeɪʃən/ noun2 •Summing; summing up; adding (adding up) of a series of items. •Summarization; summary; summing up.In a summation of changed times, we have a lost station site in Bournemouth (now occupied by a coach park) as well as its former hotel (still clinging on as apartments). — 2021 formssummations