01 n. The eighth part of a circle; an arc of 45 degrees.
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1.
The eighth part of a circle; an arc of 45 degrees.(Geom.)
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2.
The position or aspect of a heavenly body, as the moon or a planet, when half way between conjunction, or opposition, and quadrature, or distant from another body 45 degrees.(Astron. & Astrol.)
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3.
An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O°, but being itself the eighth part of a circle. Cf. Sextant. Also: quadrant See: Sextant
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4.
One of the eight parts into which a space is divided by three coordinate planes.(Math. & Crystallog.)