Can you explain what you mean? This definition for meritocracy: "government or the holding of power by people selected on the basis of their ability." says nothing about fairness. If people are able to gain increased ability based on privilege than you have an unfair meritocracy. Since it is pretty clear that you can indeed do this, through parental involvement, tutoring, nutrition, better medical care, etc. than it follows that meritocracy is not fair.