completer|kəmˈpliːtə(r)| [f. complete v. + -er1.] One who completes. 1701Whitehead Truth Prev. 123 The Efficient Cause, Worker, and Compleater of this Baptism.1868G. Macdonald R. Falc. I. 243 We shall have..more modifiers and completers, and fewer inventors.