DICTATOR
authoritarian, dictator
(noun) a person who behaves in a tyrannical manner; “my boss is a dictator who makes everyone work overtime”
dictator, potentate
(noun) a ruler who is unconstrained by law
dictator
(noun) a speaker who dictates to a secretary or a recording machine
Source: WordNet® 3.1
Etymology
Noun
dictator (plural dictators)
A totalitarian leader of a country, nation, or government.
(historical) A magistrate without colleague in republican Ancient Rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a war.
A tyrannical boss or authority figure.
A person who dictates text (e.g. letters to a clerk).
Source: Wiktionary
Dic*ta"tor, n. Etym: [L.]
1. One who dictates; one who prescribes rules and maxims
authoritatively for the direction of others. Locke.
2. One invested with absolute authority; especially, a magistrate
created in times of exigence and distress, and invested with
unlimited power.
Invested with the authority of a dictator, nay, of a pope, over our
language. Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition