Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Black's Law Dictionary: 2nd Edition

    Persons examined as witnesses in a cause, who testify in regard to some professional or technical matter arising in the case, and who are permitted to give their opinions as to such matter on account of their special training, sklll or familiarity with it An expert is a person who possesses peculiar skill and knowledge upon the subject-matter that he is required to give an opinion upon. State v. Phair, 48 Vt. 366. An expert is a skillful or experienced person; a person having skill or experience, or peculiar knowledge on certain subjects, or in certain professions ; a scientific witness. See Congress & E. Spring Co., v. Edgar, 99 U. S. 657, 25 L. Ed. 487; Heald v. Thing, 45 Me. 394; Nelson v. Sun Mut. Ins. Co.., 71 N. Y. 460; Koccis v. Slate, 56 N. J. Law, 44, 27 Atl. 800; Dole v. Johnson. 50 N. H. 453; Ellingwood . Bragg, 52 N. H. 489.