definition of
surrogate

[1] #1 surrogate n. [alternate, replacement] someone who takes the place of another person. wn

[2] #2 surrogate s. [foster] providing or receiving nurture or parental care though not related by blood or legal ties; "foster parent"; "foster child"; "foster home"; "surrogate father". wn

[3] #3 surrogate n. [deputy] a person appointed to represent or act on behalf of others. wn