(n.) Observation of difference; distinction.

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