intervalyoudaoicibaDictYouDict[interval 词源字典]
interval: [13] The val- of interval represents Latin vallum ‘rampart’ (source of English wall) – so etymologically the word means ‘space between ramparts’. That was the original sense of its Latin ancestor, intervallum, but already in the classical period the metaphorical ‘gap in time, pause’ was developing.
=> wall[interval etymology, interval origin, 英语词源]
interval (n.)youdaoicibaDictYouDict
early 14c., from Old French intervalle (14c.), earlier entreval (13c.), from Late Latin intervallum "space, interval, distance," originally "space between palisades or ramparts," from inter "between" (see inter-) + vallum "rampart" (see wall (n.)). Metaphoric sense of "gap in time" was present in Latin.