1. a person who dials a telephone number
Usage: British spelling
2. a device or software program that automatically dials telephone numbers
Usage: British spelling; computing

Examples

• The dialler waited patiently for someone to answer the phone.
• She worked as a dialler at the telemarketing company.
• The automatic dialler called hundreds of numbers each hour.
• Install the dialler software to connect to your internet service provider.
• The dialler program saved time by automatically placing calls.
• He configured the dialler to retry busy numbers after five minutes.