GMAT Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 050 arable (adj) suitable (as land) for plowing arbiter (n) One chosen or appointed, by mutual consent of parties in dispute, to decide matters arbitrary (adj) Fixed or done capriciously arbitrate (v) To act or give judgment as umpire arbor (n) A tree arboreal (adj) Of or pertaining to a tree or trees arborescent (adj) Having the nature of a tree arboretum (n) A botanical garden or place devoted to the cultivation of trees or shrubs