Madam (noun)

1. A polite or formal way of addressing a woman, typically one in a position of authority.
2. The female head of a household or organization.

Origin:

Mid 16th century: from french madame, from italian signora, from signor "sir".

Examples:

1. The receptionist addressed the customer as Madam.
2. Madam President, may I speak?
3. The Madam of the brothel was arrested for her involvement in illegal activities.
4. Madam, may I take your order?
5. The Madam of the house welcomed the guests with a warm smile.