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WORDNET DICTIONARY

Noun alteration has 3 senses

• alteration(n = noun.event) change, modification - an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago"
has particulars: acceleration, deceleration, retardation, slowing, avulsion, break, mutation, sublimation, surprise, birth, nascence, nascency, nativity, breakup, detachment, separation, vagary, fluctuation, variation, conversion, death, decease, expiry, decrease, drop-off, lessening, destabilization, increase, easing, moderation, relief, deformation, transition, shift, transformation, transmutation, scintillation, sparkling, twinkle, play, shimmer, transmutation, damage, harm, impairment, development, revolution, chromosomal mutation, genetic mutation, mutation, sex change, loss of consciousness
is a kind of happening, natural event, occurrence, occurrent
Derived form verb alter₁

• alteration(n = noun.act) adjustment, modification - the act of making something different (as e.g. the size of a garment); Array
has particulars: laxation, loosening, tightening, accommodation, adaptation, tune
is a kind of change
Derived forms verb alter₁, verb alter₃

• alteration(n = noun.act) revision - the act of revising or altering (involving reconsideration and modification); "it would require a drastic revision of his opinion"
has particulars: distraction, misdirection, modulation, qualification, reorganization, metamorphosis, transfiguration
is a kind of transformation, translation

CIDE DICTIONARY

THESAURUS

alteration

about-face, accommodation, adaptation, adjustment, amelioration, analysis, anatomization, apostasy, atomization, betterment, break, change, change of heart, changeableness, changeover, constructive change, continuity, conversion, defection, degeneration, degenerative change, demarcation, desynonymization, deterioration, deviation, difference, differencing, differentiation, discontinuity, discrimination, disequalization, disjunction, distinction, distinguishment, divergence, diversification, diversion, diversity, division, fitting, flip-flop, fluctuation, gradual change, improvement, individualization, individuation, melioration, metamorphosis, mitigation, modification, modulation, mutation, overthrow, particularization, passage, personalization, qualification, radical change, re-creation, realignment, redesign, reform, reformation, remaking, renewal, reshaping, restructuring, reversal, revision, revival, revivification, revolution, segregation, separation, severalization, severance, shift, shilly-shally, specialization, sudden change, switch, total change, transformation, transit, transition, turn, turnabout, upheaval, vacillation, variation, variety, violent change, wavering, worsening

ROGET THESAURUS

alteration

Difference

N difference, variance, variation, variety, diversity, dissimilarity, disagreement, disparity, distinction, contradistinction, alteration, modification, permutation, moods and tenses, nice distinction, fine distinction, delicate distinction, subtle distinction, shade of difference, nuance, discrimination, differentia, different thing, something else, apple off another tree, another pair of shoes, horse of a different color, this that or the other, differing, different, diverse, heterogeneous, multifarious, polyglot, distinguishable, dissimilar, varied, modified, diversified, various, divers, all manner of, all kinds of, variform, daedal, other, another, not the same, unequal, unmatched, widely apart, poles apart, distinctive, characteristic, discriminative, distinguishing, incommensurable, incommensurate, differently, il y a fagots et fagots.

Variation

N variation, alteration, modification, moods and tenses, discrepance, discrepancy, divergency, deviation, aberration, innovation, varied, modified, diversified.

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.

For further exploring for "alteration" in Webster Dictionary Online