1.(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
2.characterized by firm and unwavering conviction;
a foursquare refusal to yield
3.in a square position;
the building stood foursquare
4.with firmness and conviction; without compromise;
he stood foursquare for religious liberty and toleration- C.G.Bowers