Emily Dickinson Lexicon

LAWN, n.¹ [W. llan, an open, clear place. It is the same, word as land, with an appropriate signification, and coincides with plain, planus, Ir. cluain, Sp. llano.]

An open space between woods, or a plain in a park or adjoining a noble seat. Betwixt them lawns or level downs, and flocks / Grazing the tender herbs, were interspers'd. – Milton.