foursquare

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having four equal sides and four right angles; square.
• adjective Marked by firm, unwavering conviction or expression; forthright.
• adjective Of or being a style of American residential architecture popular especially in the early 20th century, usually having two and a half stories and characterized by a square boxy shape and a four-room floor plan.
• adverb In a forthright manner; squarely.
• noun A child's game in which each of four players stands in one of four boxes drawn on the ground in a two-by-two grid and must bounce a ball into another player's box without holding the ball or stepping out of bounds.

from The Century Dictionary.

• Having four sides and four angles equal; quadrangular: as, a foursquare altar.
• noun A figure with four equal sides.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having four sides and four equal angles.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having four equal sides; square.
• adjective by extension Solid, robust.
• adjective cryptography Pertaining to a four-square cipher.
• adjective architecture, US A boxy style of domestic architecture with four rooms to a floor, one of which is usually a stair hall.
• adjective Pertaining to the International Church of the Foursquare Gospel.
• noun Alternative form of four square.
• noun cryptography a four-square cipher

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adverb in a square position
• adjective characterized by firm and unwavering conviction
• adverb with firmness and conviction; without compromise
• noun (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon