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The Clue
90-degree arc (8 letter answer)
The Answer
QUADRANT
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Notes
The answer QUADRANT is so rare that it appears less than once every 2500 puzzles.
Related Clues
Navigator's aid
Definition
QUADRANT as a noun:
1. (quadrant, right angle) = a quarter of the circumference of a circle
2. (quadrant, quarter-circle) = a quarter of the circumference of a circle
3. any of the four areas into which a plane is divided by two orthogonal coordinate axes
4. the area enclosed by two perpendicular radii of a circle
5. a measuring instrument for measuring altitude of heavenly bodies