What does the word redundant mean?

Usage examples for redundant

  1. The essential features of a definition are that the term defined shall be described in terms that are simpler than, or at least better known than, the thing itself; that this shall be done in such a way as to limit the term to the thing defined; and that the description shall not be redundant. – The Teaching of Geometry by David Eugene Smith
  2. The corn, I say, will not be bought unless money be relatively redundant; you answer me by supposing it already bought and the question to be only concerning the payment. – Letters of David Ricardo to Thomas Robert Malthus, 1810-1823 by David Ricardo