Absorption Rate  
The ratio of the number of properties in an area that have been sold against the number available. Used to show the volatility of a market.

Abstract
A summary; an abridgment. Before the use of photo static copying public records were kept by abstracts of recorded documents. 

Abstraction Method
This method of estimating the value of property uses similar properties available in the same market to extract the value of a parcel of land. Real estate seo term

Abstract of Title
A summary of the public records relating to the title to a particular piece of land. An attorney or title insurance company reviews an abstract of title to determine whether there are any title defects which must be cleared before a buyer can purchase clear, marketable, and insurance title.

Acceleration Clause
Provision in a mortgage document stating that if a payment is missed or any other provision is violated the whole debt becomes immediately due and payable.

Accessibility
The practice of making websites usable by disabled people - especially blind people.Because search engines are essentially blind (ie they can't see pictures or use Ffash) accessible websites tend to have better search engine rankings than inaccessible websites.

Accesorry Building
A building separate from the main structure on a property. Often used for a specific purpose, such as a workshop, storage shed or garage.

Acknowledgment
Formal declaration before a public official that one has signed a document. Prior to recording real estate legal documents, such as grant deeds and deeds of trust, a Notary Public acknowledges the person's signature on the document.

Accretion  
The natural growth of a piece of land resulting from forces of nature

Acre
A measure of land equal to 43,560 square feet.