noun

• A male given name from Frankish
• A surname.
• An English surname originating as a patronymic.
• A surname from Irish [in turn originating as a patronymic], an anglicization of Lobhaois, itself from Old French Louis.
• A surname from Welsh [in turn originating as a patronymic], an adopted anglicization of Llywelyn.
• The title given to a partially apprenticed Freemason who is normally the Master or Son of a practicing Freemason; one practising or learning the degrees of Freemasonry after introduction to the degrees and before full induction or before becoming a Worshipful Brother.
• A locale in the United States:
• A census-designated place in Montezuma County, Colorado.
• An unincorporated community in Vigo County, Indiana.
• A minor city in Cass County, Iowa.
• A minor city in Edwards County, Kansas; named for journalist M. M. Lewis.
• An unincorporated community in Henry County, Missouri; named for landowner Howell Lewis.
• A town in Essex County, New York; named for Morgan Lewis, 3rd Governor of New York.
• A town in Lewis County, New York; named for its county, itself for Morgan Lewis.
• An unincorporated community in Granville County, North Carolina.
• A town in Essex County, Vermont; named for landowners Nathan, Sevignior and Timothy Lewis.
• A census-designated place in Clam Falls, Polk County, Wisconsin; named for founder Charles E. Lewis.
• A ghost town in California.
• A number of townships, listed under Lewis Township.
• A cramp iron inserted into a cavity in order to lift heavy stones; used as a symbol of strength in Freemasonry.
• (by extension, figurative) The son of a Freemason, envisaged as assisting his father in heavy work or in old age.
• A kind of shears used in cropping woollen cloth.
• Ellipsis of Isle of Lewis; an island in Scotland, United Kingdom. [An island area, the larger northern part of Lewis and Harris, in the Outer Hebrides, Western Isles council area, Scotland.]