quadrangle

noun

1. A geometric shape with four angles and four straight sides; a four-sided polygon.
2. A courtyard which is quadrangular.

   “I looked up from my desk and saw that suddenly there were big flakes twirling down into the quadrangle, settling on the carefully pruned shrubbery bordering the crosswalks, the three elms still holding many of their leaves, the still-green lawns.”

3. The buildings forming the border of such a courtyard.

   “The quadrangle surrounding the Far Common was never considered absolutely essential to the Devon School.”