Noah Webster's 1828 American Dictionary of the English Language is regarded by many as the finest English
dictionary ever published. The dictionary is available in many forms. I made the content available here for my own purposes,
out of personal admiration for this particular dictionary.
A'KER, n. [Gr., L. ager.] Originally an open field. But in G. Britain the quantity of land in the aker is fixed by statute at four thousand eight hundred and forty square yards, making one hundred and sixty square rods, perches or poles; and this is the quantity of land it contains in the United States of America. [See Acre.]