(LGBT, pseudoscience) The use of psychiatric or psychological treatment to change the sexual orientation or gender identity of a person; used especially as an attempt to heterosexualize gay people.

the conversion of Paul the Apostle to Christianity on the road to Damascus / (by extension) any life-changing event in which one's views are significantly altered

A sudden and complete change in one's beliefs.

A full-sized cargo van that is sent to third-party companies to be outfitted with various luxuries for road trips and camping.

plural of type conversion

(software) changing an entity from one datatype to another according to explicit or implicit rules.

An academic course by which a student studying a certain subject can change to another subject.

plural of conversion course

(set phrase) Acceptance of religious belief immediately before one dies, typically in a state of anxiety or fear of the insecurity of what will happen to one in and after death.

(computing theory) One of the three rewrite rules of lambda calculus, which expresses a sort of tautology about function application. The rule says that a lambda abstraction of the form (𝜆x.(fx)) may be rewritten as simply f, provided that x does not occur freely in f (considered by itself).