Definition of Expert witness

Babylon English Dictionary
professional person who gives relevant testimony from the field of his expertise (Law)
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Expert witness Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. a witness who has knowledge not normally possessed by the average person concerning the topic that he is to testify about
(antonym) lay witness
(hypernym) witness
Expert witness Definition from Medicine Dictionaries & Glossaries
The Glossary of the American Council on Science and Health
A specialist who, on the basis of having special knowledge in a particular field, testifies in a legal proceeding.
Expert witness Definition from Law Dictionaries & Glossaries
The 'Lectric Law Library
When knowledge of a technical subject matter might be helpful to a trier of fact, a person having special training or experience in that technical field, one who is called an expert witness, is permitted to state his or her opinion concerning those technical matters even though he or she was not present at the event. For example, an arson expert could testify about the probable cause of a suspicious fire.

A person who testifies at a trial because she has special knowledge in a particular field. This entitles her to testify about her opinion on the meaning of facts. Non-expert witnesses are only permitted to testify about facts they observed and not their opinions about these facts. In family law trials, common expert witnesses include: Actuaries, who testify about values of spouses' pension plans for the purpose of dividing them at divorce; Child psychologists or development specialists, who testify about the best interests of the child when custody or visitation is in dispute; Appraisers, who testify about property values when the parties cannot agree, and; Career counselors, who testify about a homemaker's ability to return to the work force for the purpose of determining the amount and duration of alimony.
Courtesy of the 'Lectric Law Library.
Law Dictionary
A witness having special knowledge, skill or experience in thesubject about which he or she is to testify.
Divorcesource.com Dictionary
a professional used to help a judge reach a decision. Experts can include: Appraisers, Counselors, Evaluators, Accountants.
TAO OF DIVORCE A - Z
In divorce cases, most experts are called to testify as to the value of the marital home, pensions, and privately-held businesses. In child related disputes, mental health professionals
are often called to testify.
Massachusetts Divorce Law Dictionary
In divorce cases, most experts are called to testify as to the value of the marital home, pensions, and privately-held businesses. In child-related disputes, mental health professionals are often called to testify.
HMCS Legal Terms
Person employed to give evidence on a subject in which they are qualified or have expertise 
By Her Majesty's Courts Service. Published under Crown Copyright.
Expert witness Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
An expert witness, professional witness or judicial expert is a witness, who by virtue of education, training, skill, or experience, is believed to have expertise and specialised knowledge in a particular subject beyond that of the average person, sufficient that others may officially and legally rely upon the witness's specialized (scientific, technical or other) opinion about an evidence or fact issue within the scope of his expertise, referred to as the expert opinion, as an assistance to the fact-finder. Expert witnesses may also deliver expert evidence about facts from the domain of their expertise. At times, their testimony may be rebutted with a learned treatise, sometimes to the detriment of their reputations.

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