A Dictionary of Canadianisms on Historical Principles (DCHP) is a historical usage dictionary of words, expressions, or meanings which are native to Canada or which are distinctively characteristic of Canadian usage though not necessarily exclusive to Canada. The first edition was edited by Walter S. Avis (ed.-in-chief), C. Crate, P. Drysdale, D. Leechman, M. H. Scargill, C. J. Lovell, and published in 1967 by W. J.