Medical Definition of afferent. : bearing or conducting inward; specifically : conveying impulses toward the central nervous systemâcompare efferent.
Imperial Weight Units. The imperial system of weights, or more correctly the avoirdupois system of weights is the standard system of weight in the United States and is still in common usage in the United Kingdom. The system is based on a pound (lb) of 16 ounces (oz).
Imperial units or the Imperial system is a collection of units, first defined in the British Weights and Measures Act of 1824. Imperial units are not used in the United States. However the U.S. system of units is similar to the Imperial system which was used officially in the United Kingdom until 1995.