The Collaborative International Dictionary of English v.0.48:

pub \pub\ (p[u^]b), n. [Shortened from Public house.]
   A retail business where alcoholic beverages are sold by the
   drink; a bar; a tavern.
   [PJC]

WordNet (r) 3.0 (2006):

pub
    n 1: tavern consisting of a building with a bar and public
         rooms; often provides light meals [syn: public house,
         pub, saloon, pothouse, gin mill, taphouse]

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

PUB

   PUBlishing.


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

public directory
pub

   The top-level "pub" (public) directory on a computer that
   allows remote access, originally via FTP.  The pub directory
   typically contains a random collection of freely available
   files.

   (2020-02-09)