ラテン語のeo, to goに由来し、語源的にはexit (eo 過去分詞), commencement (eo 現在分詞)と同じである。
英語の語源
cation (n.)
1834, from Greek kation "going down," neuter present participle of katienai "to go down," from kata "down" (see cata-) + ienai "to go" (see ion). Proposed by the Rev. William Whewell (1794-1866), English polymath, and published by English physicist Michael Faraday.
例文
1. Messaging allows real-time communi- cation by keyboard with up to five people at any one time.