外がい部ぶ性せいMeaningsNoun1. externalitiesKanji used外outside部section性nature (of a person)Composed of外がい部ぶoutside (e.g. of a building); exterior; outside (of a group, company, etc.); outside worldNoun性せいnature (of a person); sex; gender; sex (i.e. sexual attraction, activity, etc.); -ty; -ity; -ness; -cyNoun