Definition of rational

The word "rational" has its roots in ancient Greek philosophy. The Greek word "logikos" (λογικός) means "of or pertaining to reason," and was used by philosophers such as Aristotle and Plato to describe the study of logic and reasoning. The Latin word "rationalis," derived from "ratio," meaning "reason," was later adopted into Middle English as "rational." In the 14th century, the word gained its modern English meaning, referring to something governed by reason, as opposed to emotion or instinct. Over time, the concept of rationality evolved to encompass scientific inquiry, empirical evidence, and the application of logical principles to make decisions. Today, the term "rational" is widely used in various fields, from philosophy and science to economics and politics, to describe actions, decisions, or theories that are guided by sound reasoning and evidence-based analysis.