[v] evolve so as to lead to a new species or develop in a way most suited to the environment, of populations of plants and animals
[v] become more special; "We specialize in dried flowers"
[v] suit to a special purpose; "specialize one's research"
[v] be specific about; "Could you please specify your criticism of my paper?"
[v] devote oneself to a special area of work; "She specializes in honey bees"; "This plumber specialized in jacuzzis"