(astronomy, geology) A long, narrow, steep-sided depression on a planet (often other than Earth), a moon, or another body in the Solar System. / (astronomy, obsolete, rare) An aurora.

simple past tense and past participle of muster out

plural of base rate fallacy

(Canada, historical) Former name of Parliament Hill. A hill in Ottawa, Ontario, Canada / (Canada, historical, military) A former military outpost in Ottawa, Ontario, Canada.