mountain range moun·tain·range uncommon noun 1. a series of hills or mountains “the valley was between two ranges of hills” “the plains lay just beyond the mountain range” Synonymsrangemountain rangerange of mountainschainmountain chainchain of mountains Related words Broader terms geological formation Narrower terms AdirondacksAdmiralty RangeAlaska RangeAllegheniesAlpsAndesApenninesAppalachians Part of massifpass WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.