characterized by firm and unwavering conviction; "a foursquare refusal to yield"

in a square position; "the building stood foursquare"

with firmness and conviction; without compromise; "he stood foursquare for religious liberty and toleration"- C.G.Bowers; "dealt straightforwardly with all issues"

Wiess' traditional game, played on the Acabowl court for hours on end. An exceptionally skillful volley series is described as "Good Fourplay." I don't recall ever seeing anyone play this during my three ye ars...

Having four sides and four equal angles.

(geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon; "you can compute the area of a square if you know the length of its sides"