Emily Dickinson Lexicon

A'KER, n. [Gr. αγρος; L. ager; Sax. acer, pronounced aker; Germ. acker. The most correct orthography is aker.]

Originally an open field. But in Great 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.]