longadjectivecommon nounadverbproper nounSyllable DecompositionlongEtymologyexpand(10th century) from the Latin longus (which lasts a long time). long term appears in 1250. (1080) lonc.Definition1. Length, as opposed to width.expandCes rideaux ont deux mètres de long.PlurallongsSee alsoLong (pn.)