Definitions:

1. A measuring instrument used historically for determining latitude by measuring the altitude of celestial bodies. NOUN
   • The sailor used an old quadrant to measure the altitude of the sun at noon to estimate their latitude.
2. One of the four parts into which a plane is divided by the horizontal and vertical axes. NOUN
   • In the Cartesian coordinate system, points in the first quadrant have positive X and Y coordinates.
3. The quarter of a circle, or of the circumference of a circle, an arc of 90 degrees. NOUN
   • In mathematics, a quadrant is one-fourth of a circle, measuring 90 degrees.

Synonyms:

• 90 degrees
• half plane
• half-space
• quarter
• quarter-circle

NearBy Words:

• quadrantanopia