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1. Active Directory.

2. Administrative Domain. Refers to groups of computers and the network infrastructure operated and managed by a single organisation.

3. Abbreviation for the Latin phrase "Anno Domini", which means "in the year of our Lord". It denotes that a year is after the believed year of birth of Christ. "Anno Domini" is actually an abbreviation of "Anno Domini Nostri Jesu Christi" which means "in the year of our Lord Jesus Christ."

4. Abbreviation for "Advertisement". This can refer to any form of advertisement, including banner ads, pop-up (or pop-behind) advertisements, tv or radio advertisements etc.

5. Analogue to Digital conversion or Analogue to Digital converter. The process of converting an analogue input to a digital output.