acker in English dictionary acker Meanings and definitions of "acker" (regional, now rare) A visible current in a lake or river; a ripple on the surface of water. Obsolete form of acre. noun (regional, now rare) A visible current in a lake or river; a ripple on the surface of water. noun [i]Obsolete form of acre[/i]. more Grammar and declension of acker acker ( plural ackers) acker (plural ackers) more Sample sentences with "acker" Declension Stem Try again Authors