differentiate
     v 1: mark as different; "We distinguish several kinds of maple"
          [syn: {distinguish}, {separate}, {secern}, {secernate},
          {severalize}, {severalise}, {tell}, {tell apart}]
     2: be a distinctive feature, attribute, or trait; sometimes in
        a very positive sense; "His modesty distinguishes him form
        his peers" [syn: {distinguish}, {mark}]
     3: calculate a derivative; take the derivative [ant: {integrate}]
     4: become different during development; "cells differentiate"
        [ant: {dedifferentiate}]
     5: evolve so as to lead to a new species or develop in a way
        most suited to the environment [syn: {speciate}, {specialize},
         {specialise}]
     6: become distinct and acquire a different character
Source: WordNet® 2.0