n. A circumstance in which a choice must be made between three options that seem equally undesirable.
n. A syllogism containing three alternatives that each infer the same conclusion.
the GNU version of the Collaborative International Dictionary of English
n. A syllogism with three conditional propositions, the major premises of which are disjunctively affirmed in the minor. See dilemma.
n. A state of things in which it is difficult to determine which one of three courses to pursue.
The Century Dictionary and Cyclopedia
n. In logic, a syllogism with three conditional propositions, the major premises of which are disjunctively affirmed in the minor. See dilemma.
n. Hence, in general, any choice between three objects.
Word Usage
"The biggest problem in expanding Medicare is essentially solving what economist Greg Mankiw calls the trilemma, the three problems of health care delivery - cost, access and quality."