#1 Commons n. [park, commons, common, green] a piece of open land for recreational use in an urban area; "they went for a walk in the park". wn #2 Commons n. [commons, common land] a pasture subject to common use. wn #3 Commons n. [commonalty, commonality, commons] a class composed of persons lacking clerical or noble rank. wn #4 Commons n. [third estate] the common people. wn