The Spanish word 'imperio' (meaning 'empire') comes from the Latin word 'imperium', meaning 'power, command, or empire'. 'Imperium' itself was derived from the Latin verb 'imperare' meaning 'to command', which was formed by combining two elements: the prefix 'in-' ('in, into') and the verb 'parare' ('to prepare, arrange'). The combination of these elements evolved to mean 'to command' or 'to exercise power over', and from there developed into the concept of an empire or imperial power.

Several common Spanish words share this etymology with 'imperio'. The verb 'imperar' means 'to rule' or 'to predominate'. The adjective 'imperial' refers to anything relating to an empire or emperor. 'Emperador' (emperor) and 'emperatriz' (empress) are also related, all stemming from the same Latin roots of power and command.

English speakers can easily connect 'imperio' to several familiar English words. 'Empire', 'imperial', and 'emperor' all share the same Latin ancestry. Even the word 'imperative' (meaning something that is absolutely necessary or commanding) comes from this same Latin root 'imperare'. The connection between commanding or ruling and these related words makes their shared history quite logical.