foursquare /ˈfɔːskwɛː/adjective 4noun 2forms 3 adjective4 •Having four equal sides; square.From the foursquare royal tower on the city's eastern edge to the Dominican monastery of the Blackfriars in the west, its skyline was a forest of spires and belltowers. — 2011 •Solid, robust.Another initially foursquare wine that develops lovely fruit in the glass, with a toasty-biscuity finish beginning to build. — 1999 •Pertaining to the International Church of the Foursquare Gospel. •Pertaining to a four-square cipher. noun2 •(US) A boxy style of domestic architecture with four rooms to a floor, one of which is usually a stair hall. •A four-square cipher. formsfoursquares · more foursquare · most foursquare