G5181: Τύραννος

1. an absolute sovereign , unlimited by law or constitution, (Herdotus Historicus), etc.: not applied to old hereditary sovereignties βασιλεῖαι); such as those of (Homer) or of Sparta; for the term rather regards the irregular way in which the power was gained , than the way in which it was exercised , being applied to the mild Pisistratus, but not to the despotic kings of Persia. However, the word soon came to imply reproach, like our tyrant , (Plato Philosophus), etc.
2. in a wider sense, the tyrant's son , or any member of his family , (Sophocles Tragicus):—;so, ἡ τύραννος was both the queen herself or a princess , (Euripides)
3. τύραννος, ον, as adjective kingly, royal , [variant datesTragica Adespota
4. imperious, despotic , (Thucydides); τύραννα δρᾶν (Sophocles Tragicus)
τύραννος is probably from same Root as κύριος, κοίρανος. (ML)