noun

• Any of the numerous species of birds belonging to several genera within the family Corvidae, including Garrulus, Cyanocitta, Aphelocoma, Perisoreus, Cyanocorax, Gymnorhinus, Cyanolyca, Ptilostomus, and Calocitta, allied to the crows, but smaller, more graceful in form, often handsomely coloured, usually having a crest, and often noisy.
• Any of various other birds of similar appearance and behaviour.
• The Indian roller, Coracias benghalensis.
• Any of various large papilionid butterflies of the genus Graphium.
• (archaic) A dull or ignorant person. It survives today in the term jaywalking.
• (obsolete) Promiscuous woman; prostitute.
• The name of the Latin-script letter J.
• (slang) A marijuana cigarette; a joint.
• (countable) An English surname transferred from the nickname from Old French jai (“jay (bird)”), a nickname for a chatty or showy person.
• A placename
• A hamlet in Leintwardine parish, Herefordshire, England; named in the c. 13th century for the Jay family, prominent in that area (OS grid ref SO3974).
• A locale in the United States.
• A town in Santa Rosa County, Florida; named for postmaster J. T. Nowling.
• A town in Franklin County, Maine; named for American statesman and Founding Father John Jay.
• A town in Essex County, New York; named for John Jay.
• A city, the county seat of Delaware County, Oklahoma; named for Jay Washburn, nephew of Cherokee leader Stand Watie.
• A town on the Canadian border in Orleans County, Vermont; named for John Jay.
• A township in Martin County, Minnesota.
• A township in Elk County, Pennsylvania.
• A former settlement in California.
• A diminutive of the male given names James, Jacob, Jack, John, or Jason, or for any other name beginning with ⟨J⟩; also used as a formal given name.
• A female given name
• (India) A male given name from Hindi.