wahine with a kahako (line above a or some of you identify this as "macron") is PLURAL for woman .. so women ... na (plural) or ka (nonplural) is 'the' ... as in the women or the woman.
Ka wahine (no a kahako) is the woman. Na wahine (with a kahako) is the women.
wahine (no a kahako) is woman. wahine (with a kahako) is women.
**SORRY ... doesnt let me type the letter kahako here. :(