Definitions from Wiktionary ( )

▸ adjective:  Having four equal sides; square.
▸ adjective:  (by extension) Solid, robust.
▸ adjective:  (cryptography) Pertaining to a four-square cipher.
▸ adjective:  Pertaining to the International Church of the Foursquare Gospel.
▸ noun:  (countable, cryptography) A four-square cipher.
▸ noun:  (countable, architecture, US) A boxy style of domestic architecture with four rooms to a floor, one of which is usually a stair hall.
▸ noun:  (uncountable) Alternative form of four square [A sport played by four players where players have to hit a ball into other people's squares, and attempt to make a return hit.]

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