From WordNet (r) 2.0 (August 2003) [wn]:
foursquare
adj : characterized by firm and unwavering conviction; "a
foursquare refusal to yield"
n : (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" [syn: square]
adv 1: in a square position; "the building stood foursquare"
2: with firmness and conviction; without compromise; "he stood
foursquare for religious liberty and toleration"-
C.G.Bowers; "dealt straightforwardly with all issues"
[syn: squarely, straightforwardly]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Foursquare \Four"square`\ (f[=o]r"skw[^a]r`), a.
Having four sides and four equal angles. --Sir W. Raleigh.
[1913 Webster]