What is to make void; to render invalid; to deprive of legal force or efficacy. Such correspondence would at once nullify the conditions of the probationary system. I. Taylor. See Abolish called?

nullify — To make void; to render invalid; to deprive of legal force or efficacy. Such correspondence would at once nullify the conditions of the probationary system. I. Taylor. See Abolish. (Webster's 1913.)