The act of turning or changing from one state or condition to another, or the state of being changed; transmutation; change. [1913 Webster]
"Artificial conversion of water into ice." [1913 Webster]

"The conversion of the aliment into fat." [1913 Webster]
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. Prescott. [1913 Webster]
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. [1913 Webster]
"Or bring my action of conversion
And trover for my goods." [1913 Webster]
The act of interchanging the terms of a proposition, as by putting the subject in the place of the predicate, or the contrary. [1913 Webster]
A change or reduction of the form or value of a proposition; as, the conversion of equations; the conversion of proportions. [1913 Webster]
A change of front, as a body of troops attacked in the flank. [1913 Webster]
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. [1913 Webster]
"He oft
Frequented their assemblies, . . . and to them preached
Conversion and repentance, as to souls
In prison under judgments imminent." [1913 Webster]

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OXFORD DICTIONARY

conversion, n.
1 a the act or an instance of converting or the process of being converted, esp. in belief or religion. b an instance of this.
2 a an adaptation of a building for new purposes. b a converted building.
3 transposition, inversion.
4 Theol. the turning of sinners to God.
5 the transformation of fertile into fissile material in a nuclear reactor.
6 Rugby Football the scoring of points by a successful kick at goal after scoring a try.
7 Psychol. the change of an unconscious conflict into a physical disorder or disease.

Etymology

ME f. OF f. L conversio -onis (as CONVERT)

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THESAURUS

conversion

Fabianism, about-face, abstraction, abuse, abuse of office, accommodation, adaptation, adjustment, adoption, alteration, amelioration, annexation, apostasy, appropriation, architecture, assembly, befoulment, betterment, block, blocking, boosting, break, building, casting, change, change of heart, changeableness, changeover, circumcision, composition, construction, constructive change, continuity, conveyance, corrupt administration, crafting, craftsmanship, creation, cultivation, debasement, defalcation, defection, defense mechanism, defilement, degeneration, degenerative change, desecration, deterioration, deviation, devising, difference, discontinuity, divergence, diversification, diversion, diversity, elaboration, embezzlement, erection, evangelization, extraction, extremism, fabrication, fashioning, filching, fitting, flip-flop, formation, forming, formulation, fouling, framing, fraud, gradual change, gradualism, graft, growing, handicraft, handiwork, harvesting, improvement, innovation, liberation, lifting, machining, making, maladministration, malfeasance, malpractice, malversation, manufacture, manufacturing, melioration, meliorism, mental block, metamorphosis, milling, mining, misapplication, misappropriation, misconduct, misemployment, misfeasance, mishandling, mismanagement, misusage, misuse, mitigation, modification, modulation, molding, mutation, new birth, new life, novelty, overthrow, peculation, permutation, persuasion, perversion, pilferage, pilfering, pinching, poaching, pollution, poor stewardship, prefabrication, preparation, processing, producing, profanation, progressivism, proselytism, proselytization, prostitution, qualification, radical change, radical reform, radicalism, raising, re-creation, realignment, rebirth, reclamation, redeemedness, redemption, redesign, refining, reform, reformation, reformism, regeneration, remaking, renewal, repression, reshaping, restructuring, reversal, revisionism, revival, revivification, revolution, salvation, scrounging, second birth, shaping, shift, shoplifting, smelting, snatching, sneak thievery, snitching, spiritual purification, stealage, stealing, sublimation, sudden change, suppression, swindle, swiping, switch, symbolization, theft, thievery, thieving, total change, transformation, transition, transmutation, turn, turnabout, turning, upheaval, utopianism, variation, variety, violation, violent change, workmanship, worsening

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ROGET THESAURUS

conversion

Change

N change, alteration, mutation, permutation, variation, modification, modulation, inflexion, mood, qualification, innovation, metastasis, deviation, turn, evolution, revolution, diversion, break, transformation, transfiguration, metamorphosis, transmutation, deoxidization, transubstantiation, mutagenesis transanimation, transmigration, metempsychosis, avatar, alterative, conversion, revolution &c (sudden or radical change), inversion, displacement, transference, changeableness, tergiversation, changed, newfangled, changeable, transitional, modifiable, alterative, mutatis mutandis, Int, quantum mutatus!, a change came o'er the spirit of my dream, nous avons change tout cela, tempora mutantur nos et mutamur in illis, non sum qualis eram, casaque tourner, corpora lente augescent cito extinguuntur, in statu quo ante bellum, still ending and beginning still, vox audita perit littera scripta manet.

Conversion

N conversion, reduction, transmutation, resolution, assimilation, evolution, sea change, change of state, assumption, naturalization, transportation, development, developing, conversion of currency, exchange of currency, exchange rate, bureau de change, chemistry, alchemy, progress, growth, lapse, flux, passage, transit, transition, transmigration, shifting, phase, conjugation, convertibility, crucible, alembic, caldron, retort, convert, pervert, renegade, apostate, converted into, convertible, resolvable into, transitional, naturalized, gradually, &c (slowly) 275 in transitu.

Piety

N piety, religion, theism, faith, religiousness, holiness, saintship, religionism, sanctimony, reverence, humility, veneration, devotion, prostration, grace, unction, edification, sanctity, sanctitude, consecration, spiritual existence, odor of sanctity, beauty of holiness, theopathy, beatification, adoption, regeneration, conversion, justification, sanctification, salvation, inspiration, bread of life, Body and Blood of Christ, believer, convert, theist, Christian, devotee, pietist, the good, the righteous, the just, the believing, the elect, Saint, Madonna, Notre Dame, Our Lady, the children of God, the children of the Kingdom, the children of the light, pious, religious, devout, devoted, reverent, godly, heavenly- minded, humble, pure, holy, spiritual, pietistic, saintly, saint-like, seraphic, sacred, solemn, believing, faithful, Christian, Catholic, elected, adopted, justified, sanctified, regenerated, inspired, consecrated, converted, unearthly, not of the earth, ne vile fano, pure-eyed Faith, thou hovering angel girt with golden wings.

Also see definition of "conversion" in Bible Study Dictionaries