The Collaborative International Dictionary of English v.0.48:
Port \Port\, n. [AS. port, L. portus: cf. F. port. See Farm,
v., Ford, and 1st, 3d, & 4h Port.]
1. A place where ships may ride secure from storms; a
sheltered inlet, bay, or cove; a harbor; a haven. Used
Peering in maps for ports and piers and roads.
We are in port if we have Thee. --Keble.
2. In law and commercial usage, a harbor where vessels are
admitted to discharge and receive cargoes, from whence
they depart and where they finish their voyages.
Free port. See under Free.
Port bar. (Naut,)
(a) A boom. See Boom, 4, also Bar, 3.
(b) A bar, as of sand, at the mouth of, or in, a port.
Port charges (Com.), charges, as wharfage, etc., to which a
ship or its cargo is subjected in a harbor.
Port of entry, a harbor where a customhouse is established
for the legal entry of merchandise.
Port toll (Law), a payment made for the privilege of
bringing goods into port.
Port warden, the officer in charge of a port; a harbor
Bouvier's Law Dictionary, Revised 6th Ed (1856):
PORT TOLL, Mer. law., By this phrase is understood the money paid for the
privilege of bringing goods into a port.