两者均是物权法上的术语，与土地的地役权（easement)相关。dominant tenement为“承役地”或“需役地”，指得到其他地产给予的地役权的土地 [1] ; servient tenement为“供役地”， 则是指给予其他地产地役权之土地 [2] 。一般说来，dominant tenement 为英式英语[3]; 在美国，其常被称为dominant estate、upper estate 或 dominant property。而 servient tenement 也被人称为 servient estate、lower estate 或 servient property。
    
[1] "An estate that benefits from an easement. " Cf. Bryan A. Gamer, Black's Law Dictionary, 7th edition, at p. 567，West Group (1999).
[2] “An estate burdened by an easement. ”Id. at p. 569.
[3] Cf. P. H. Collin, Dictionary of Law, 2nd edition, at p. 182, Peter Collin Publishing Ltd. (1993 ).