Definition of "UA"

UA

adjective
not comparable
1. Initialism of underage.
noun
countable and uncountable, plural UAs
1. (military) Initialism of unauthorized absence.
2. (countable, UK, government) Initialism of unitary authority.
3. (countable, computing) Initialism of user agent.
  Quotations
  A “mail user agent” (MUA or UA) that lets users read and compose mail[.]
  2011, Evi Nemeth et al., UNIX and Linux System Administration Handbook, Pearson Education, page 744