Page 146 of the PHB lists some of the most common weapon properties. Page 195 of the PHB goes over the rules for two-weapon fighting, stating that you must be holding a weapon in both hands – both of which must have the "light" property. The Dual Wielder feat on page 165 further modifies this by saying that the weapons you may use for two-weapon fighting don't need to be light.
The issue I'm running into is that the Dual Wielder feat specifies that the weapons must be "one-handed" even though there's no such weapon property as "one-handed".
Does this mean that one can use any weapons that may be used with one hand (including versatile weapons)? Or must the weapons lack both the two-handed and versatile properties (meaning the weapon must be exclusively used with one hand)?