Noun
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(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"
Adjective
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characterized by firm and unwavering conviction
"a foursquare refusal to yield"
Adverb
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with firmness and conviction
without compromise
"he stood foursquare for religious liberty and toleration"- C.G.Bowers
"dealt straightforwardly with all issues"
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in a square position
"the building stood foursquare"