trilemma

Noun

tri=lem=ma

CIDE DICTIONARY

trilemma, n. [NL., fr. Gr. (see Tri-) + any thing received, in logic, an assumption. Cf. Dilemma.].

A syllogism with three conditional propositions, the major premises of which are disjunctively affirmed in the minor. See Dilemma. [1913 Webster]
A state of things in which it is difficult to determine which one of three courses to pursue. [1913 Webster]