A commercial solicitation designed to sell some commodity, service or similar.
A public notice.
In gin rummy, the discarding of a card of one's preferred suit so as to mislead the opponent into thinking you do not want it.
A recommendation of a particular product, service or person.
A continuous function from a topological space onto a subspace which is the identity on that subspace.
An act or instance of retracting.
A statement printed or broadcast in a public forum which effects the withdrawal of an earlier assertion, and which concedes that the earlier assertion was in error.