A device or software program that automatically dials phone numbers, often used for making many calls in sequence without human intervention.
From autodial + -er (agent suffix). Widely used since the 1980s, particularly in telemarketing and customer service industries.
Autodialers can make hundreds of calls per hour—they're so efficient at reaching people that they've become synonymous with unwanted robocalls. It's a tool whose name is now associated with annoyance because of how it's been misused.
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