1. (

• Sitter ,
• Willem_de_Sitter

) Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934) ;

2. (

• sitter ,

) an organism (person or animal) that sits ;

3. (

• babysitter ,
• baby-sitter ,
• sitter

) a person engaged to care for children when the parents are not home ;

4. (

• artist's_model ,
• sitter ,

) a person who poses for a painter or sculptor ;

5. (

• brood_hen ,
• broody ,
• broody_hen ,
• setting_hen ,
• sitter

) a domestic hen ready to brood ;