Dictionary.net

• y[=oo]ng'k[.e]r, n. a young German noble or squire.--n. JUNK'ERISM, the narrow political and social ideas of the aristocratic party in Prussia called Junkers.

1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

• Young German noble; member of exclusive aristocratic party in Prussia. [German]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry