| a. | 1. | Having four sides and four equal angles. |
| Noun | 1. | foursquare - (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" Synonyms: square |
| Adj. | 1. | foursquare - characterized by firm and unwavering conviction; "a foursquare refusal to yield" |
| Adv. | 1. | foursquare - in a square position; "the building stood foursquare" |
| 2. | foursquare - with firmness and conviction; without compromise; "he stood foursquare for religious liberty and toleration"- C.G.Bowers; "dealt straightforwardly with all issues" Synonyms: straightforwardly, squarely |