English

lagtime

From lag + time.

A compound of lag + time

North Germanic

English lag

Proto-Indo-European *deh₂y- ‘to divide’

…

Proto-Germanic *tīmô ‘division, period; time’

Proto-West Germanic *tīmō

Old English tīma ‘time, period’

Middle English tyme

English time

Today it means

noun The elapsed time between two events.

Language periods are conventional ranges, not dates for this word.