From Middle English lengthe, from Old English lengþu ("longness; length"), from Proto-West Germanic *langiþu, from Proto-Germanic *langiþō, equivalent to long + -th. Cognate with Scots lenth, lainth, Saterland Frisian Loangte ("length"), West Frisian lingte, langte, Dutch lengte ("length"), German Low German Längde, Längd, Längte, Längt, Danish længde ("length"), Swedish längd ("length"), Icelandic lengd ("length").
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