Legitimate (adjective)

1. Lawful and conforms to the rules and principles of a particular system or society.
2. Having a valid claim or right, especially to inherit property or a title.
3. Reasonable and acceptable within the given circumstances.

Origin:

Late 16th century: from french légitime, from latin legitimus, from lex, leg- "law".

Examples:

1. The company's business practices are legitimate and in compliance with the law.
2. The heir to the throne has a legitimate claim to the crown.
3. The protest was a legitimate expression of the people's anger and frustration.
4. The teacher considered the excuse for missing the exam to be a legitimate reason.
5. The request for more information was a legitimate concern for the safety of the workers.