in a way that is fair, sensible, and based on good thinking; within acceptable limits.
From Old French 'raisnable' (rational), from Latin 'rationabilis,' from 'ratio' (reason, calculation). The suffix '-ably' turns it into an adverb.
Reasonably appears constantly in legal and business language because it's deliberately vague—a 'reasonable person' standard lets judges interpret what's fair without rigid rules, making language do the heavy lifting.
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