interference

The act of interfering with something, or something that interferes.

Somewhat impeded by constant political interference of one sort or another, British Railways are nevertheless pressing ahead with a mammoth modernisation programme; [...]

"With magic in limited use and hidden, it was possible to enhance the various magic resistances of humans, and to keep certain forms of magic from being possible. If magic enters common usage, this interference becomes infeasible."

The illegal obstruction of an opponent in some ball games.

They were glued to the TV, as the referee called out a fifteen yard penalty for interference.

An effect caused by the superposition of two systems of waves.

A distortion on a broadcast signal due to atmospheric or other effects.

They wanted to watch the game on TV, but there was too much interference to even make out the score on the tiny screen.

In United States patent law, an inter partes proceeding to determine the priority issues of multiple patent applications; a priority contest.

To interfere.

In economic terms, the two production processes can be simultaneously implemented without interferencing between themselves.