im·pe·ra·tor^[1]

Ave Imperator, morituri te salutant – Hail, Emperor! Those who are about to die salute you!
tempus rerum imperator – time, commander of all things

impedimentum – difficulty, hindrance, impediment, obstacle
impedio – ensnare, entangle, hinder, hold fast, obstruct, prevent, surround, to entangle
impeditio – hindrance
impeditus – embarassed, entagles, hindered, obstructed, prevented
impedo – ensnare, hinder, obstruct, prevent, to entangle
impenetrabiilis – impenetrable
imperiosus – dominering, imperious, powerful
imperito – to govern
imperium – authority, command, control, power to command, realm, rule, sovereignty
impero – command, hold sway, to command, to give orders, to rule

im·pe·ra·tor[1]