Here are some relevant definitions from CARFAX:
Bonded Title — A title is bonded when the owner has no proof of ownership during the titling process. The bond remains in effect for three years or until the vehicle is no longer registered in the state.
Canadian Damage Report — CARFAX receives damage reports for many accidents occurring in the following Canadian Provinces: Ontario, Alberta, Nova Scotia, New Brunswick, Prince Edward Island, Newfoundland, Yukon territories, Northwest territories, and Nunavut. These reports may be completed following an accident or other incident. Some include a damage claim amount. This amount represents physical damage to the vehicle and depending on the accident, damage to other vehicles and/or property. It does not include expenses like towing, a rental car or any medical related items.
Canadian Total Loss Vehicle — An insurance company declares a vehicle a total loss if the estimated repair cost, plus the salvage value of the damaged vehicle, exceeds the cash value of the vehicle before it was damaged. A Canadian vehicle declared a total loss may require a technical inspection before it can return to the road.
Damage Disclosure — When the owner discloses to a DMV or other CARFAX source that the vehicle sustained damage. The extent of damage can range from minor to severe. CARFAX recommends you have this vehicle inspected.
Dismantled Title — The vehicle sustained major damage to one or more major component parts and the cost of repairing the vehicle for safe operation exceeds its fair market value. When a Dismantled title is issued, the vehicle may be used only for parts or scrap metal. It cannot be re-titled or returned to the road.
Fire Damage Title — The vehicle sustained major damage due to fire. In most states, fire damage titles are issued when the cost of repairing the vehicle for safe operation exceeds its fair market value.
Flood Damage Title — States issue flood titles when a vehicle has been in a flood or has received extensive water damage.
Junk Title — A Junk Title is issued on a vehicle damaged to the extent that the cost of repairing the vehicle exceeds ~ 75% of its pre-damage value. This damage threshold may vary by state. The majority of states use this title to indicate that a vehicle is not road worthy and cannot be titled again. Some states treat Junk titles the same as Salvage.
Lemon Law Vehicle — A vehicle with major problems that has been repurchased by or had its price renegotiated with the manufacturer. The state marks its official records or issues a title brand for lemon law vehicles. Laws vary by state as to the specific requirements for a "lemon". Most manufacturers issue some buybacks that are not the result of Lemon Laws but rather a courtesy.
Not Actual Mileage Title — When the seller certifies, under the Federal Odometer Act, that the odometer reading does not reflect the vehicle's actual mileage. This may occur because the odometer was tampered with, broken, or replaced.
Rebuilt/Reconstructed Title — A Rebuilt/Reconstructed vehicle is a salvage vehicle that has been repaired and restored to operation. These vehicles are often severely damaged before they are rebuilt and refurbished parts are typically used during reconstruction. In most states, an inspection of the vehicle is required before the vehicle is allowed to return to the road.
Salvage Title — A Salvage Title is issued on a vehicle damaged to the extent that the cost of repairing the vehicle exceeds ~ 75% of its pre-damage value. This damage threshold may vary by state. Some states treat Junk titles the same as Salvage but the majority use this title to indicate that a vehicle is not road worthy and cannot be titled again in that state. The following eleven states also use Salvage titles to identify stolen vehicles - AZ, FL, GA, IL, MD, MN, NJ, NM, NY, OK and OR.
Scrapped — Vehicles that have been dismantled and/or crushed and should not return to the road.
Total Loss Vehicle — An insurance or fleet company declares a vehicle a total loss when a claim exceeds ~ 75% of its pre-damage value or if the vehicle is stolen and not recovered. This damage threshold varies by company. These companies typically take possession and obtain the title. Not all total loss vehicles result in a DMV-reported branded title. This may occur when an insurance company's definition of a total loss is different than the state DMV's definition for a branded title or when the owner of the vehicle is a self-insured company, like a fleet or rental company.
The entire list of definitions can be found here:
http://www.carfax.com/definitions/glossary.cfm
