quadrant
noun(quad-rant)
an instrument for measuring altitudes consisting commonly of a graduated arc of 90 degrees with an index or vernier and usually having a plumb line or spirit level for fixing the vertical or horizontal direction
quadrant
noun(quad-rant)
a device or mechanical part shaped like or suggestive of the quadrant of a circle
quadrant
noun(quad-rant)
an arc of 90 degrees that is one quarter of a circle