(historical) A system proposed by U.S. President Ronald Reagan on March 23, 1983, to use ground-based and space-based systems to protect the United States from attack by strategic nuclear ballistic missiles.

(business) A response to an attempted hostile takeover of a company, in which the target company, or a 'white knight' acting on its behalf, tries to turn the situation round by acquiring all or much of the other company.

Alternative form of Two Knights' Defence

Alternative form of Two Knights' Defence

plural of Pac-Man defense

Synonym of attack is the best form of defence

Alternative spelling of attack is the best form of defence

(baseball) A measure of a pitcher's effectiveness based only on plays that do not involve fielders. Originally included only hit-by-pitch, walks, strikeouts, and home runs allowed, but more recently incorporates fly ball percentage, ground ball percentage, and line drive percentage.

(military, defence) A United States Army system designed to shoot down ballistic missiles in their terminal phase.