Meaning

noun (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon

noun the product of two equal terms

noun an open area at the meeting of two or more streets

originFrom Middle English square, sqware, squyre; from Old French esquarre, esquerre, (modern French équerre), from Vulgar Latin *exquadra, from Latin ex- + quadro, from quadrus (compare English quad and quadra). Doublet of squad and squadra. Displaced Old English fēowerecge (fēower nominative + ecg accusative, as in "four-edged").

Etymology from Wiktionary, CC BY-SA 3.0