obstruction. 1. Something that impedes or hinders, as in a street, river, or design; an obstacle. 2. The act of impeding or hindering something; interference. 3.Oil & gas. A common-law doctrine that suspends the running of time under an oil-and-gas lease or extends the lease for a reasonable period of time if rights granted under the lease are interfered with by the lessor or someone claiming through the lessor.

[Blacks Law 8th]