Is the translation of a word (tse’med), which properly means a yoke, and denotes a space of ground that may be ploughed by a yoke of oxen in a day. It is about an acre of our measure (Isa. 5:10; 1 Sam. 14:14).
Acre
2 verses
1 Samuel
1 Samuel 14:14
And that first slaughter, which Jonathan and his armourbearer made, was about twenty men, within as it were an half acre of land, which a yoke of oxen might plow.
Isaiah
Isaiah 5:10
Yea, ten acres of vineyard shall yield one bath, and the seed of an homer shall yield an ephah.
From Easton's Bible Dictionary
Matthew George Easton, 1897