From Old English 'lengþu,' the abstract noun of 'long' — from Proto-Germanic *langaz.
The measurement of something from end to end.
From Old English 'lengþu' meaning 'length, tallness,' from Proto-Germanic *langþō, from *langaz (long). Simply the abstract noun of 'long' — length is 'long-ness.' Key roots: *langaz (Proto-Germanic: "long").