What is the meaning of specialize?

verb

• Become more focus on an area of activity or field of study.
  • usage: "She specializes in Near Eastern history"
  • synonyms: specialise, narrow, narrow down
• Be specific about.
  • usage: "Could you please specify your criticism of my paper"
  • synonyms: specify, particularize, particularise, specialise
• Suit to a special purpose.
  • usage: "specialize one's research"; "this kind of beak has become specialized in certain Galapagos finches"
  • synonyms: specialise
• Devote oneself to a special area of work.
  • usage: "She specializes in honey bees"; "This baker specializes in French bread"
  • synonyms: specialise
• Evolve so as to lead to a new species or develop in a way most suited to the environment.
  • synonyms: speciate, differentiate, specialise