frustration

The Court of Claims erred in failing to distinguish between an appropriation of property and the frustration of an enterprise by reason of the exercise of a superior governmental power. ... 'Frustration and appropriation are essentially different things.' The frustration of respondent's plans and expectations which resulted when the United States chose to undertake the project on its own account did not take property from respondent in the sense of the Fifth Amendment.

Defined by the Supreme Court in - United States v. Grand River Dam Authority, 363 U.S. 229 (1960).