[{"Bold_text": "noun", "List Items": ["a quarter of a circle; an arc of 90°.", "the area included between such an arc and two radii drawn one to each extremity.", "something shaped like a quarter of a circle, as a part of a machine.", "Geometry, Astronomy.one of the four parts into which a plane, as the face of a heavenly body, is divided by two perpendicular lines, numbered counterclockwise from upper right:the first quadrant of the moon.", "an instrument, usually containing a graduated arc of 90°, used in astronomy, navigation, etc., for measuring altitudes.", "Astrology.one of the four quarters of the horoscope: determined by the ascendant, nadir, descendant, and midheaven and numbered counterclockwise from the ascendant.", "Furniture.one of two metal sliding pieces, of quadrant form, used to support the fall front of a desk from above."]}]