kağan — meaning in English

English meaning

khagan noun A historical ruler of a khaganate, an imperial title held by certain Turkic and Mongolian peoples and equal in rank to an emperor.
khan noun A historical title for a ruler or nobleman among Turkic and Mongol peoples, most famously Genghis Khan.
lord noun A man who holds a title of nobility, or a ruler with power over others.

kağan is used for these senses in English:

khagan (historical) A khan of khans, a ruler of a khaganate; (the holder of) an imperial rank used among certain Turkic and Mongolian peoples, equal in status to an emperor.
khan (historical) A ruler over various Turkic and Mongol peoples in the Middle Ages.
lord One possessing similar mastery over others; (historical) any feudal superior generally; any nobleman or aristocrat; any chief, prince, or sovereign ruler; in Scotland, a male member of the lowest rank of nobility (the equivalent rank in England is baron)

noun A historical title for a ruler or nobleman among Turkic and Mongol peoples, most famously Genghis Khan.
noun A title of respect used for men of rank in parts of Central and South Asia, now also a common surname.