Engl. law. Market overt is an open or public market; that is, a place appointed by law or custom for the sale of goods and chattels at stated times in public. 2. In London, every day except Sunday, is market day. In the country, particular days are fixed for market days. 2 Bl. Com. 449. 3. It is a general rule that sales of vendible articles made in market overt, are good not only between the parties, but are also binding on all those who have any property or right therein.