1.nounA circumstance in which a choice must be made between two or more alternatives that seem equally undesirable.
2.nounA difficult circumstance or problem.
3.nounA 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".
4.nounOffering to an opponent a choice between two (equally unfavorable) alternatives.