noun.
In England, a court or board of commissioners having jurisdiction over a port (as London, Liverpool, etc.) or of a river (as the Thames, the Mersey, etc.), and charged with the regulation as well as the conservation of its navigation, fisheries, etc.
noun.
The act of conserving,guarding, or keeping with care; preservation from loss, decay, injury, or violation; the keeping of a thing in a safe or entire state.
noun.
Persistence; perdurance; permanence.