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An '''emperor''' is the male leader of an [[empire]]. '''Empress''' is the feminine form and can refer to a woman who holds the rank of emperor (empress [[regnant]]), a [[wife]] of an emperor (empress [[consort]]), or a [[widow]] of an emperor (empress [[dowager]]). Emperor is the highest temporal title there is, outranking even [[king]]. The only emperor in the world today is Emperor [[Akihito]] of [[Japan]].  However, at the beginning of the [[20th century]], other countries had emperors, including [[Austria-Hungary]], [[China]], [[Germany]], the [[Ottoman Empire]], and [[Russia]].

An '''emperor''' is the male leader of an [[empire]]. '''Empress''' is the feminine form and can refer to a woman who holds the rank of emperor (empress [[regnant]]), a [[wife]] of an emperor (empress [[consort]]), or a [[widow]] of an emperor (empress [[dowager]]). Emperor is the highest temporal title there is, outranking even [[king]]. The only emperor in the world today is Emperor [[Akihito]] of [[Japan]].  However, at the beginning of the [[20th century]], other countries had emperors, including [[Austria-Hungary]], [[China]], [[Germany]], the [[Ottoman Empire]], and [[Russia]].

Equivalent terms in other languages, sometimes used in English, include ''[[Kaiser]]'' in [[German]], ''[[Tsar]]'' (царь) in [[Russian language|Russian]], ''Kōtei'' (皇帝) in [[Chinese language|Chinese]] (which is itself a reference to the Yellow Emperor of Chinese mytho-historical tales, and ''[[Tenno]]'' in [[Japanese]].

Equivalent terms in other languages, sometimes used in English, include ''[[Kaiser]]'' in [[German]], ''[[Tsar]]'' (царь) in [[Russian language|Russian]], ''Kōtei'' (皇帝) in [[Chinese language|Chinese]] (which is itself a reference to the Yellow Emperor of Chinese mytho-historical tales), and ''[[Tenno]]'' in [[Japanese]].

Emperor is also a species of [[penguin]].

Emperor is also a species of [[penguin]].