outdoors(noun, adverb) adverb1. outside a buildingSimilar word(s): alfresco, outsideSentences with outdoors as an adverb:- They went outdoors to light up their cigarettes. noun1. where the air is unconfined- he wanted to get outdoors a littleSimilar word(s): openDefinition categories: location, exterior, outsideSentences with outdoors as a noun:- She loves the outdoors.