1. a person who takes care of children while their parents are away
Usage: informal
2. a person who poses for a portrait or photograph
3. a person who sits, especially for a particular purpose or period

Examples

• We hired a sitter for Saturday night so we could go to dinner.
• The babysitter arrived at seven o’clock.
• The artist asked her sitter to remain perfectly still.
• The portrait painter worked with the same sitter for weeks.
• She was a patient sitter during the long photography session.
• The committee needs a reliable sitter for the evening meetings.