These are some commonly used definitions as defined by the American Society of Appraisers Machinery and Technical Specialties Discipline.

Common Values

Fair Market Value
An opinion expressed in terms of money, at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts, as of a specific date.
Orderly Liquidation Value
An opinion of the gross amount, expressed in terms of money, that typically could be realized from a liquidation sale, given a reasonable period of time to find a purchaser (or purchasers), with the seller being compelled to sell on an as-is, where-is basis, as of a specific date.
Forced Liquidation Value
An opinion of the gross amount, expressed in terms of money, that typically could be realized from a properly advertised and conducted public auction, with the seller being compelled to sell with a sense of immediacy on an as-is, where-is basis, as of a specific date.

Special Values

Fair Market Value – In Continued Use
An opinion, expressed in terms of money, at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts, as of a specific date and assuming that the business earnings support the value reported, (assumed or verified)
Fair Market Value – Installed
An opinion, expressed in terms of money, at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts, considering market conditions for the asset being valued, independent of earnings generated by the business in which the property is or will be installed, as of a specific date.
Fair Market Value – Removed
An opinion, expressed in terms of money, at which the property would change hands between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell and both having reasonable knowledge of relevant facts, considering removal of the property to another location, as of a specific date.
Reproduction Cost New
The cost of reproducing a new replica of a property on the basis of current prices with the same or closely similar materials, as of a specific date.
Replacement Cost New
The current cost of a similar new property having the nearest equivalent utility as the property being appraised, as of a specific date.
Salvage Value
An opinion of the amount, expressed in terms of money that may be expected for the whole property or a component of the whole property that is retired from service for possible use elsewhere, as of a specific date.
Scrap Value
An opinion of the amount, expressed in terms of money that could be realized for the property if it were sold for its material content, not for a productive use, as of a specific date.
Liquidation Value In Place
An opinion of the gross amount, expressed in terms of money that typically could be realized from a properly advertised transaction, with the seller being compelled to sell, as of a specific date, for a failed, non-operating facility, assuming that the entire facility is sold intact.