zip + 4

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(zĭp´ plŭs fōr`)
n.1.a full nine-digit zip code. See zip code.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Since trends indicate micro zoning win become even more important, 1-2-3 configuration provides a platform for developing better identification of individual carrier routes, in terms of either postal routes or ZIP + 4 groupings.