What is A. B? Definition of A. B in Black's Law Dictionary
A. B. Able-bodied seaman. In English law a sea- man is entitled to be rated A. B. when he has served at sea three years before the mast. In the United States the term "Able Seaman" is used. For the requirements of able seaman, see 46 U.S. C.A. § 672. Also artium baccalaureus, bachelor of arts. In England, generally written B. A.
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That's the definition of A. B in Black's Law Dictionary - Courtesy of Cekhukum.com.
