(economics) The cost of an opportunity forgone (and the loss of the benefits that could be received from that opportunity); the most valuable forgone alternative.

(theology) The idea, particularly in Christianity, that an opportunity to follow the deity, e.g. Jesus, will be an option at the time of death.

Any occasion when a politician or other celebrity may be photographed to their advantage.

(idiomatic) Ideal moment to do something.

(informal, idiomatic) The United States.

A period of time in which suitable action can achieve success.

plural of window of opportunity

(humorous) Targeting everyone indiscriminately.

Alternative spelling of equal-opportunity

op shop