A difficult circumstance or problem.
A type of syllogism of the form "if A is true then B is true; if C is true then D is true; either A or C is true; therefore either B or D is true".
A circumstance in which a choice must be made between two or more alternatives that seem equally undesirable.
Offering to an opponent a choice between two (equally unfavorable) alternatives.
A situation which poses an immediate risk and which requires urgent attention.
Arising from or used in an emergency.
An individual brought in at short notice to replace a member of staff, a player in a sporting team, etc.
The department of a hospital that treats emergencies.