Property.
Property. The term property includes money, the proceeds of property, income, dividends, interest, annuities, and other earnings, but does not include any property or interest or any of the foregoing which vested in the Attorney General or was otherwise acquired by the United States prior to December 18, 1941.
Source
26 CFR § 303.1-1
Scoping language
General. When used in this part, the terms defined in this section shall have the meaning so assigned to them. A term not defined in this section shall have the meaning, if compatible with the context, imputed thereto under the Internal Revenue Code of 1954.