open rate

noun

1

: a railroad rate included in a published tariff

2

: a rate charged by publishers for advertising space that is subject to discounts for volume purchased or frequency of use

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now