Sentence:  Sir Edward Newenden, a married man, the guardian of Ethelinde at the deceaſe of her father, and who is enamoured of his ward, is evidently a copy, "in the outline", or Mr. Monckton in the novel of Cecilia. His manners, however, are of a much more engaging nature than thoſe of his <WSD>archetype</WSD>. 
Meaning of the word marked with <WSD> tags:  An original model of which all other similar concepts, objects, or persons are merely copied, derivative, emulated, or patterned; a prototype. (from mid 16th c.)