(n.) A purposeful change; as, the modification of an opinion, or of a machine\; the various modifications of light.

about-face accommodation adaptation adjustment allophone allowance alteration alveolar amelioration analysis anatomization apico-alveolar apico-dental apostasy articulation aspiration assimilation atomization betterment bilabial break cacuminal cerebral cession change change of heart changeableness check circumscription concession consonant constructive change continuant continuity conversion defection degeneration degenerative change demarcation dental desynonymization deterioration deviation difference differencing differentiation diphthong discontinuity discrimination disequalization disjunction dissimilation distinction distinguishment divergence diversification diversion diversity division epenthetic vowel exception exemption explosive extenuating circumstances fitting flip-flop glide glottal glottalization gradual change grain of salt grant guttural hedge hedging improvement individualization individuation labial labialization labiodental labiovelar laryngeal lateral limitation lingual liquid manner of articulation melioration mental reservation metamorphosis mitigation modulation monophthong morphophoneme mutation mute nasal occlusive overthrow palatal parasitic vowel particularization peak personalization pharyngeal pharyngealization phone phoneme plosive prothetic vowel qualification radical change re-creation realignment redesign reform reformation remaking renewal reservation reshaping restriction restructuring retroflex reversal revival revivification revolution salvo segmental phoneme segregation semivowel separation severalization severance shift sonant sonority special case special treatment specialization specialness specification speech sound stop sudden change surd switch syllabic nucleus syllabic peak syllable tempering total change transformation transition transition sound transmogrification triphthong turn turnabout upheaval variation variety velar violent change vocable vocalic vocoid voice voiced sound voiceless sound voicing vowel waiver worsening