caveat emp·tor /-ˈɛm(p)tɚ/
 Ca·ve·at n.
 1. Law A notice given by an interested party to some officer not to do a certain act until the party is heard in opposition; as, a caveat entered in a probate court to stop the proving of a will or the taking out of letters of administration, etc.
 2. U. S. Patent Laws A description of some invention, designed to be patented, lodged in the patent office before the patent right is applied for, and operating as a bar to the issue of letters patent to any other person, respecting the same invention.
 Note: ☞ A caveat is operative for one year only, but may be renewed.
 3. Intimation of caution; warning; protest.
    We think it right to enter our caveat against a conclusion.   --Jeffrey.
 Caveat emptor  Law, let the purchaser beware, i. e., let him examine the article he is buying, and act on his own judgment.
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 caveat emptor
      n : a commercial principle that without a warranty the buyer
          takes upon himself the risk of quality