1. (n.) The act of specializing, or the state of being specialized.

2. (n.) The setting apart of a particular organ for the performance of a particular function.

alteration analysis anatomization area art atomization bag business calling career career building careerism change craft cup of tea demarcation desynonymization differencing differentiation discrimination disequalization disjunction distinction distinguishment diversification division field forte game handicraft individualization individuation itemization lifework line line of business line of work localization long suit main interest manner metier mission modification mystery number occupation particularization peculiarization personalization pet subject practice profession pursuit racket segregation separation severalization severance specialism speciality specialty strong point style technicality thing trade type variation vocation walk walk of life way weakness work