Definition of "landgrave" [land•grave]

• A man in medieval Germany who had jurisdiction over a particular territory. (noun)
• Used as the title for such a nobleman. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""landgrave," but returned to New York, and ultimately (1680) to"
• "Other signs there are taken from physiognomy, metoposcopy, chiromancy, which because Joh. de Indagine, and Rotman, the landgrave of Hesse his mathematician, not long since in his"
• "Christopher Rotman, the landgrave of Hesse's mathematician, in their astronomical epistles, whether it be the same Diaphanum clearness, matter of air and heavens, or two distinct essences?"