superlative form of sincere: most sincere

A window sash that is hinged on the side. / A window having such sashes; a casement window.ᵂᵖ / (military) Occasionally seen as a usage error due to the similarity of the words: A casemate.

(meteorology) A weather phenomenon where the polar vortex breaks down, causing a sudden temperature increase in the stratosphere of 50 kelvin or more.

(archaic) simple past tense and past participle of bewitch