The Collaborative International Dictionary of English v.0.48:

fedora \fe*do"ra\ (f[i^]*d[^o]r"[.a]), n.
   A soft felt hat with a crown creased lengthwise.

   Syn: felt hat, homburg, Stetson, trilby.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

fedora
    n 1: a hat made of felt with a creased crown [syn: fedora,
         felt hat, homburg, Stetson, trilby]

The Free On-line Dictionary of Computing (30 December 2018):

Fedora

    An open source project, sponsored
   by Red Hat, Inc., and potentially feeding into their
   products.

   Fedora Home (http://fedora.redhat.com/).

   (2005-12-27)