Emily Dickinson Lexicon

LAND'GRAVE, n. [G. landgraf; D. landgraaf. Graf or graaf is an earl or count, Sax. gerefa, a companion or count. It is contracted into reeve, as in sherif, or shire-reeve.]

In Germany, a count or earl; or an officer nearly corresponding to the earl of England, and the count of France. It is now a title of certain princes who possess estates or territories called landgraviates. – Encyc.