an area, usually paved, adjoining a house and used as an area for outdoor lounging, dining, etc.
2.
a courtyard, esp. of a house, enclosed by low buildings or walls.
Origin: 1820–30, Americanism; < Sp, OSp: courtyard, perh. orig. open area; cf. ML patium meadow, pasturage, perh. deriv. of L *patitus, ptp. of patēre to lie open. See patent
1828, "inner court open to the sky," from Sp. patio probably from O.Prov. patu, pati "untilled land, communal pasture," from L. pactum "agreement" (see pact). Another theory traces the Sp. word to L. patere "to lie open." Meaning "paved and enclosed terrace beside a building" first recorded 1941. Patio furniture is attested from 1969.