aerial photography

to heat empty cookware (as when forgetting to put water in a kettle, pot, etc.); to dry heat cookware

heating empty cookware (as when forgetting to put water in a kettle, pot, etc.); dry heating cookware

(military, of the Japan Air Self-Defense Force) a lieutenant general

(military, of the Japan Air Self-Defense Force) a field officer

(military, of the Japan Air Self-Defense Force) an airman

(military, of the Japan Air Self-Defense Force) a junior officer

(military, of the Japan Air Self-Defense Force) a non-commissioned officer

high in the sky

(mathematics) empty set