The Collaborative International Dictionary of English v.0.48:

Hat \Hat\,
   sing. pres. of Hote to be called. Cf. Hatte. [Obs.] "That
   one hat abstinence." --Piers Plowman.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hat \Hat\ (h[a^]t), n. [AS. h[ae]t, h[ae]tt; akin to Dan. hat,
   Sw. hatt, Icel. hattr a hat, h["o]ttr hood, D. hoed hat, G.
   hut, OHG. huot, and prob. to L. cassis helmet. [root]13. Cf.
   Hood.]
   A covering for the head; esp., one with a crown and brim,
   made of various materials, and worn by men or women for
   protecting the head from the sun or weather, or for ornament.
   [1913 Webster]

   Hat block, a block on which hats are formed or dressed.

   To pass around the hat, to take up a collection of
      voluntary contributions, which are often received in a
      hat. [Colloq.] --Lowell.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hat \Hat\ (h[aum]t), a.
   Hot. [Obs.] --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hat
    n 1: headdress that protects the head from bad weather; has
         shaped crown and usually a brim [syn: hat, chapeau,
         lid]
    2: an informal term for a person's role; "he took off his
       politician's hat and talked frankly"
    v 1: put on or wear a hat; "He was unsuitably hatted"
    2: furnish with a hat

The Free On-line Dictionary of Computing (19 January 2023):

hat

   A common (spoken) name for the circumflex ("^", ASCII 94)
   character.

   See ASCII for other synonyms.

   [Jargon File]


The Jargon File (version 4.4.7, 29 Dec 2003):

hat
 n.

    Common (spoken) name for the circumflex (‘^’, ASCII 1011110) character. See
    ASCII for other synonyms.