From anah, in the sense of depression or tilling; a furrow -- + acre, furrow.
see HEBREW anah
H4618. maanah
מַעֲנָה noun feminine place for task (?), specifically field for ploughing: — plural suffix לְמַעֲנוֺתָם Psalm 129:3 Kt they have extended their ploughing-grounds (Qr מַעֲנִיתָם); singular מַעֲנָה only 1 Samuel 14:14, where text corrupt and meaning dubious see Commentaries
מַעֲנִית Psalm 129:3 Qr see foregoing.