meaning of personal digital assistant

1. Personal Digital Assistant PDA A small hand-held computer typically providing calendar, contacts, and note-taking applications but may include other applications, for example a web browser and media player. Small keyboards and pen-based input systems are most commonly used for user input. The Apple Newton was a fairly early example. [First? Notable examples? Current Best?]
2. a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.

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