1. publications that are issued three times a week
Usage: plural form

Examples

• The newspaper company publishes several triweeklies in addition to their daily paper.
• Local triweeklies often cover community news that larger papers miss.
• The magazine rack featured both weeklies and triweeklies.
• Many small towns rely on triweeklies for their local news coverage.
• The publisher decided to convert some of their weeklies into triweeklies to reduce costs.