Authority (noun)

1. The power or right to give orders, make decisions, and enforce obedience.
2. A person or organization having formal power or control in an area or over a person.
3. Expert knowledge or skill in a particular subject or activity.

Origin:

Late middle english: from old french autorité, from latin auctoritas, from auctor 'author, founder, or promoter' (see author).

Examples:

1. The government has the authority to control the country's borders.
2. The authority is responsible for enforcing the law.
3. The CEO's authority over the company was absolute, and all decisions were made by him.
4. The expert's authority on the subject was established by his extensive research and publications.
5. The authority is widely recognized as an expert in the field.
6. The teacher's authority in the classroom was never questioned by the students.