The term "reasonable purpose" is a legal concept that refers to an action taken with a justifiable or proper motive. It implies that the individual taking such action had good intentions and was not acting maliciously, recklessly or without cause. The determination of what constitutes a reasonable purpose is often made by courts in the context of various legal disputes, including those related to contracts, torts, property law, and criminal law. In essence, it means that an action taken with a reasonable purpose is considered lawful and justified under the circumstances.