LoranPronunciation: /ˈlɔːran, ˈlɒ-/Definition of Loran noun [mass noun] a system of long-distance navigation in which position is determined from the intervals between signal pulses received from widely spaced radio transmitters: he checked his bearings on the loran [as modifier]:a loran signalOrigin: 1940s: from lo(ng-)ra(nge) n(avigation)Loran in other Oxford dictionaries Definition of Loran in the US English dictionary