alfresco(adjective, adverb) adjective1. in the open air- an alfresco lunchSimilar word(s): outdoor, outsideSentences with alfresco as an adjective:- The walking district features many alfresco cafés. adverb1. outside a buildingSimilar word(s): outdoors, outsideSentences with alfresco as an adverb:- As it was a sunny afternoon, we decided to dine alfresco on the patio.