δίλημμα

Dilemma comes from Greek δίλημμα (dilemma), from di- (twice, double) + lemma (premise, proposition, thing taken). In ancient Greek rhetoric and logic, a dilemma was a specific argumentative form: an opponent is presented with two alternatives, both of which lead to an unfavorable conclusion. The dilemma was a trap made of logic — whichever horn you chose, you were gored.

The metaphor of horns is old and vivid. The Latin phrase argumentum cornutum (horned argument) described the dilemma as a charging bull: dodge left and the left horn catches you, dodge right and the right horn does. Medieval logicians elaborated the metaphor into trilemmas (three horns) and polylemmas (many), but the original two-horned dilemma remained the purest form of being stuck.

English borrowed 'dilemma' in the 1520s, initially keeping its strict logical meaning. But by the seventeenth century, the word had loosened. Any difficult choice, any situation with only bad options, became a dilemma — even when there were more than two alternatives. Prescriptivists have protested this loosening for centuries. The protests have failed.

The dilemma structure permeates modern ethical thought. The trolley problem, the prisoner's dilemma, Sophie's choice, the Euthyphro dilemma — all are formal structures built on the Greek insight that sometimes every available option is wrong. Game theory, the mathematical discipline that shapes modern economics and military strategy, is largely the study of dilemmas at scale.