Meaning

noun the linear extent in space from one end to the other; the longest dimension of something that is fixed in place

noun continuance in time

noun the property of being the extent of something from beginning to end

originFrom Middle English lengthe, from Old English lengþ, lengþu, from Proto-West Germanic *langiþu, from Proto-Germanic *langiþō, equivalent to long + -th (abstract nominal suffix). Cognate with Scots lenth, lainth (“length”), Saterland Frisian Loangte (“length”), West Frisian lingte, langte (“length”), Dutch lengte (“length”), German Low German Längde, Längd, Längte, Längt (“length”), Danish længde…

Etymology from Wiktionary, CC BY-SA 3.0