economist

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A specialist in economics.
• noun Archaic An economical person.

from The Century Dictionary.

• noun One who manages pecuniary or other resources; a manager in general, with reference to means and expenditure or outlay.
• noun Specifically A careful or prudent manager of pecuniary means; one who practises frugality in expenditure: as, he has the reputation of being an economist; he is a rigid economist.
• noun One versed in economics, or the science of political economy.
• noun An officer in some cathedrals of the Church of Ireland who is appointed by the chapter to manage the cathedral fund, to see to the necessary repairs, pay the church officers, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who economizes, or manages domestic or other concerns with frugality; one who expends money, time, or labor, judiciously, and without waste.
• noun One who is conversant with political economy; an expert in the field of economics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An expert in economics, especially one who studies economic data and extracts higher-level information or proposes theories.
• noun One concerned with political economy.
• noun obsolete One who manages a household.
• noun obsolete One who economizes, or manages domestic or other concerns with frugality; one who expends money, time, or labor, judiciously, and without waste.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an expert in the science of economics