say it: KWAH-druhnt
quadrant is a noun meaning "a quarter of the circumference of a circle". It carries 4 recorded senses.
a quarter of the circumference of a circle
any of the four areas into which a plane is divided by two orthogonal coordinate axes
the area enclosed by two perpendicular radii of a circle
a measuring instrument for measuring altitude of heavenly bodies
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for quadrant come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.