1.  transmutation(n = noun.act) transubstantiation - an act that changes the form or character or substance of something; Array
is a kind of conversion
Derived form verb transmute₂

2.  transmutation(n = noun.event) shift, transformation - a qualitative change; Array
is a kind of alteration, change, modification
has particulars: advance, betterment, improvement, population shift, pyrolysis, sea change, sublimation, tin disease, tin pest, tin plague, changeover, conversion, transition, degeneration, retrogression, strengthening, weakening

3.  transmutation(n = noun.event) Array - (physics) the change of one chemical element into another (as by nuclear decay or radioactive bombardment); "the transmutation of base metals into gold proved to be impossible"
is a kind of alteration, change, modification
Derived form verb transmute₃

1.  The act of transmuting, or the state of being transmuted; as, the transmutation of metals. [1913 Webster]

2.  The change or reduction of one figure or body into another of the same area or solidity, but of a different form, as of a triangle into a square. [1913 Webster]

3.  The change of one species into another, which is assumed to take place in any development theory of life; transformism. Bacon. [1913 Webster]

transmutation, n.
1 the act or an instance of transmuting or changing into another form etc.
2 Alchemy hist. the supposed process of changing base metals into gold.
3 Physics the changing of one element into another by nuclear bombardment etc.
4 Geom. the changing of a figure or body into another of the same area or volume.
5 Biol. Lamarck's theory of the change of one species into another.

Derivative:
transmutational adj. transmutationist n.

Etymology:
ME f. OF transmutation or LL transmutatio (as TRANSMUTE)

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.

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.