The 15th of March in the Ancient Roman calendar, on which day Julius Caesar was assassinated.

(idiomatic) A favourite, a particular preference, or a loved one; the object of somebody's affections.

The bilateral agreements concerning international air travel defined by the Chicago Convention in 1944, covering such topics as overflight, stopovers, and passenger carriage.

(idiomatic) A complex, troublesome situation arising when a decision or action produces considerable subsequent problems.

A short and/or incomplete realization of a certain method or idea to demonstrate its feasibility. / (software engineering, perhaps nonstandard) A proof of technology or pilot project.

(idiomatic) A person in unfamiliar and often uncomfortable surroundings.

An item of furniture; any item, such as a table or cupboard, that constitutes furniture.

The tendency for a continuing effort toward a particular goal to decline in effectiveness after a certain amount of success has been achieved.

(economics) In economics, the theory there is a general decrease in the utility of a product, as more units of it are consumed.

(baseball) The second part of the ninth and final inning; the end of the game. / (idiomatic) By extension, any last chance or final opportunity.