Devote oneself to a special area of work.

synonym: specialize.

Be specific about.

synonyms: particularise, particularize, specialize, specify.

Dutch: specificatie, specificeren, verbijzonderen

Suit to a special purpose.

synonym: specialize.

Become more focused on an area of activity or field of study.

synonyms: narrow, narrow down, specialize.

Evolve so as to lead to a new species or develop in a way most suited to the environment.

synonyms: differentiate, specialize, speciate.