Webster's 1828 Dictionary gives the first definition of "dictator" as "One who dictates; one who prescribes rules and maxims for the direction of others."
Noah Webster, 1828 Webster's Dictionary, accessed November 1, 2023
Dictator
DICTATOR, noun [Latin]
1. One who dictates; one who prescribes rules and maxims for the direction of others.
2. One invested with absolute authority. In ancient Rome, a magistrate, created in times of exigence and distress, and invested with unlimited power. He remained in office six months.