specialise

verb10

1. •
   To focus one's study upon a particular skill, field, topic, or genre.

   • Also, to their honour be it said, they will not allow their scholars to specialize, and, with four hours of mathematics a week, even a Newton would not go up to Cambridge knowing much. — 1881
2. •
   To focus one's business upon a particular item or service.

   • Firms... which have specialised in the manufacture of ‘heavies’... — 1908
3. •
   To make distinct or separate from what is common
4. •
   To narrow in scope.

   • He is at most a confused and wild Christian, not specialized by any form, but capable of all. — 1628
5. •
   To make distinct or separate due to form or function.
6. •
   To become distinct or separate from what is common.

   • These cells specialized for propagation, however they may originate, are accordingly distinguished by a special name, that of Spores of Sporules. — 1850
7. •
   To be known or notorious for some specialty.

   • Watson specializes in adiposeness; none of his chorus beauties may be considered featherweights. — 1923
8. •
   To train (someone) in a specialty.

   • "Kia, Honey, you got to help him to it," Bell Norton told the 16 year old girl she was "specializing" as part of the hospital's intensive care program for high risk babies and mothers. — 1981
9. •
   (rare) To specify: to mention specifically.

   • Our Sauiour specialising and nominating the places in which these false prophets should teach his presence to be. — 1616
10. •
    (no longer used) To go into specific details.

    • First lash the Great-ones ; but, if thou be wise, / In generall, and doe not speciallize : / Yet, if thou doe, so wisely let it be, / None may except but those that faulty be. — 1613