先せん使し用よう権けんMeaningsNoun1. right of prior use; prior use rights; prior user rightsKanji used先before (timewise)使use (something physical)用used for権right (to do something)Composed of先せんformer; previous; old; first move (in go, shogi, etc.); opening moveNo-adjective使し用ようuse; application; employment; utilization; utilisationNoun権けんright (to do something); authority; powerSuffix