(n.) The act of marking, or of ascertaining and setting a limit; separation; distinction.

alteration analysis anatomization atomization ban bar barring blockade bounding boycott change circling-in circumscribing circumscription contradistinction debarment debarring definition delimitation desynonymization determination differencing differentiation discrimination disequalization disjunction distinction distinctiveness distinguishment diversification division embargo encincture exception exclusion hairsplitting inadmissibility inclusion-exclusion individualization individuation injunction lockout microscopic distinction modification narrowing nice distinction nonadmission nuance omission particularization personalization preclusion prohibition rejection relegation repudiation restriction segregation separation severalization severance shade of difference specialization specification subtle distinction taboo trichoschistism variation