Initial Series

noun

: a Maya carved or written dating usually at the start of a text including the date according to the long count and the date according to the positions reached in the 260-day and 365-day periods

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