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1. Capable of reasoning; rational: a reasonable person.
2. Governed by or being in accordance with reason or sound thinking: a reasonable solution to the problem.
3. Being within the bounds of common sense: arrive home at a reasonable hour.
4. Not excessive or extreme; fair: reasonable prices.
rea′son·a·bil′i·ty, rea′son·a·ble·ness n.
a rare word for reasonableness