Definitions of specialize:

• verb:   devote oneself to a special area of work

  Example: "She specializes in honey bees"

• verb:   become more special

  Example: "We specialize in dried flowers"

• verb:   suit to a special purpose

  Example: "Specialize one's research"

• verb:   evolve so as to lead to a new species or develop in a way most suited to the environment
• verb:   be specific about