A lot is a single unit being sold in an auction. A lot can be one item (a painting, a horse, a car), a grouped set sold together (a dining-room set, a coin collection), or even a bulk container of mixed inventory (“Lot 47: contents of garage”).
Lot numbering is sequential within an auction (Lot 1, Lot 2, Lot 3…) and the lot order matters: live auctions typically schedule the most marketable items in the middle of the sale (when crowd energy peaks), with weaker lots at the start and end. Online timed auctions are less sensitive to lot order since lots close on their own schedules.
Lot grouping is a strategic decision that affects both pricing and pace. A pile of mixed costume jewelry might sell for $40 as a single lot but $120 split into three smaller lots organized by color or era. Conversely, breaking up a matching bedroom set into individual pieces typically lowers total proceeds because the set has more value as a unit. Auctioneers and consignors negotiate lot structure during cataloging — one of the most consequential decisions in the consignment process.