Conversion \Con*ver"sion\, n. [L. conversio: cf. F. conversion. See Convert.]

1. The act of turning or changing from one state or condition to another, or the state of being changed; transmutation; change.

Artificial conversion of water into ice. --Bacon.

The conversion of the aliment into fat. --Arbuthnot.

2. The act of changing one's views or course, as in passing from one side, party, or from of religion to another; also, the state of being so changed. ``Conversion to Christianity.'' --Prescott.

3. (Law) An appropriation of, and dealing with the property of another as if it were one's own, without right; as, the conversion of a horse.

Or bring my action of conversion And trover for my goods. --Hudibras.

4. (Logic) The act of interchanging the terms of a proposition, as by putting the subject in the place of the predicate, or the contrary.

5. (Math.) A change or reduction of the form or value of a proposition; as, the conversion of equations; the conversion of proportions.

6. (Mil.)
   (a) A change of front, as a body of troops attacked in the flank.
   (b) A change of character or use, as of smoothbore guns into rifles.

7. (Theol.) A spiritual and moral change attending a change of belief with conviction; a change of heart; a change from the service of the world to the service of God; a change of the ruling disposition of the soul, involving a transformation of the outward life.

He oft Frequented their assemblies, . . . and to them preached Conversion and repentance, as to souls In prison under judgments imminent. --Milton.

Source: Webster's Revised Unabridged Dictionary (1913)