A large number of Economists regard economics to be a science. To quote the opening statement from a recent article in the American Economic Review: "Among its practitioners there is a widespread feeling that modern economics has established itself as a science enjoying a high degree of consensus." "Science" according to Funk and Wagnalls College Standard Dictionary is the "knowledge as of facts, laws, and proximate causes, gained and verified by exact observations and correct thinking."
Peterson, Susan B. 1984. "Economics—A Set of Beliefs." E.C.R.S.B. 84-7. Robins School of Business White Paper Series. University of Richmond, Richmond, Virginia.