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CLEARANCE, com. law. The name of a certificate given by the collector of a port, in which is stated the master or commander (naming him) of a ship or vessel named and described, bound for a port, named, and having on board goods described, has entered and cleared his ship or vessel according to law.
     2. The Act of Congress of 2d March, 1790, section 93, directs, that the master of any vessel bound to a foreign place, shall deliver to the collector of the [dis ot?] from which such vessel shall be about to depart, a manifest of all the cargo on board, and the value thereof, by him subscribed, and shall swear or affirm to the truth thereof; whereupon the collector shall grant a clearance for such vessel and her cargo; but without specifying the particulars thereof in such clearance, unless required by the master so to do. And if any vessel bound to any foreign place shall depart on her voyage to such foreign place, without delivering such a manifest and obtaining a clearance, the master shall forfeit and pay the sum of five hundred dollars for every such offence. Provided, anything to the contrary notwithstanding, the collectors and other officers of the customs shall pay due regard to the inspection laws of the states in which they respectively act, in such manner, that no vessel having on board goods liable to inspection, shall be cleared out, until the master or other person shall have produced such certificate, that all such goods have been duly inspected, as the laws of the respective states do or may require, to be produced to the collector or other officer of the customs. And provided, that receipts for the payment of all legal fees which shall have accrued on any vessel, shall, before any clearance is granted, be produced to the collector or other officer aforesaid.
     3. According to Boulay-Paty, Dr. Com. tome 2, p. 19, the clearance is imperiously demanded for the safety of the vessel; for if a vessel should be found without it at sea, it may be legally taken and brought into some port for adjudication, on a charge of piracy. Vide Ship's papers.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
The major publication from the NCDS focused on the analysis of urea clearance, and it has become one of nephrology's classic papers.
Determining the impact of blood flow rates on urea clearance is essential for clinicians to enact evidence-informed practice and protect patients from harm.
Mean comparisons of the following indices were performed during the study period (unpaired t-test): weekly Kt/V, total weekly creatinine clearance, weekly peritoneal urea clearance, weekly renal urea clearance, BSA, TBW, nPCR, total daily drainage volume, and total daily drainage volume/[m.sup.2] BSA.
You find that she has decreased urea clearance. How might you improve her clearance?
Their prediction equations 6 and 7 decreased unexplained variance from measured GFR by more than one-half when compared with measured creatinine or urea clearance or the Cockcroft-Gault equation, i.e., from 19.6% to a range of 8.8-9.7%.
There are two formulas we use in the Southern Alberta Renal Program (SARP) to assess adequacy based on urea clearance.