#1 sitter n. [Sitter, Willem de Sitter] Dutch astronomer who calculated the size of the universe and suggested that it is expanding (1872-1934). wn
#2 sitter n. an organism (person or animal) that sits. wn
#3 sitter n. [babysitter, baby-sitter] a person engaged to care for children when the parents are not home. wn
#4 sitter n. [artist's model] a person who poses for a painter or sculptor. wn
#5 sitter n. [brood hen, broody, broody hen, setting hen] a domestic hen ready to brood. wn
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