WordNet (r) 3.0 (2006):

deb
    n 1: a young woman making her debut into society [syn:
         debutante, deb]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "deb":
   Beau Brummel, apprentice, arbiter of fashion, baby, beginner,
   catechumen, clotheshorse, clubman, clubwoman, dandy, debutant,
   debutante, entrant, fashion plate, fashionable, fledgling, fop,
   freshman, greenhorn, greeny, infant, learner, man-about-town,
   mondain, mondaine, neophyte, nestling, newcomer, novice, novitiate,
   probationer, raw recruit, recruit, rookie, socialite, subdeb,
   subdebutante, swinger, taste-maker, tenderfoot, tone-setter,
   trainee, trend-setter, tyro



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

deb

    The filename extension for a
   Debian binary package.

   (2001-01-27)