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The Collaborative International Dictionary of English v.0.48 (gcide)

Caveat \Ca"ve*at\, n. [L. caved let him beware, pres. subj. of
cavere to be on one's guard to, beware.]
[1913 Webster]
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. --Bouvier.
[1913 Webster]

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.
[1913 Webster]

Note: A caveat is operative for one year only, but may be
renewed.
[1913 Webster]

3. Intimation of caution; warning; protest.
[1913 Webster]

We think it right to enter our caveat against a
conclusion. --Jeffrey.
[1913 Webster]

{Caveat emptor} [L.] (Law), let the purchaser beware, i. e.,
let him examine the article he is buying, and act on his
own judgment.
[1913 Webster]