non-rational

The word "non-rational" is a modern English compound formed by directly applying the negative prefix "non-" to the established adjective "rational." The prefix "non-" originates from Latin non, meaning "not," a straightforward negator. The core word "rational" descends from Latin rationalis, meaning "of or belonging to reason," which itself derives from ratio (genitive rationis), meaning "reckoning, calculation, reason." The concept of ratio is linked to the Proto-Indo-European root \re-, meaning "to reason, count." Therefore, "non-rational" logically constructs its meaning by negating the quality of being based on reasoned calculation, extending from concrete counting to abstract logical thought and, in specialized contexts, to processes outside conscious reasoning.

Structure: non (not) + rational (based on reason) - non: A prefix of Latin origin, meaning "not." It functions as a negative particle. - rational: An adjective of Latin origin (from rationalis), meaning "endowed with reason" or "based on reason." It functions as the core descriptive element.