Timing
来自Big Physics
Old English tīma, of Germanic origin; related to tide, which it superseded in temporal senses. The earliest of the current verb senses (dating from late Middle English) is ‘do (something) at a particular moment’.
wiktionary
etymonline
timing (n.)
mid-13c., "a happening," verbal noun from time (v.). From 1590s as "the noting or recording of time;" 1915 as "coordination of moving parts in a machinery."
