It stands for "more or less" - and, to me, it's a strong hint that you will want a survey done, or you will at least want to see a plat map. Realtors are advised to use MOL and other disclaimers related to measurement because they are NOT surveyers or architects, and don't want to be held liable for exact figures. Example - I recently talked with a potential seller who said he had ten acres. Turns out the plat map shows only four acres... If I listed it as being 10 acres, someone might see a mis-representation lawsuit just waiting to happen. Actually, based on the plat map, I would have listed it as "4 acres, MOL".