seaborne• They had brought most of the pieces up from the harbourdefences, not anticipating another seaborneassault meantime.• a seaborne attack• Between 1670 and 1750 the capital's intake of seabornecoal from the north-east averaged an annual half a million tons.• Bristol, too, took in a whole range of seaborne food supplies.• It looked even then as if the seaborneinvasion might not be necessary.• In 1963 two more of the second-generation seabornelisteningposts were commissioned.• For Venice, the freedom of navigation along the Adriatic was vital to the maintenance of its seaborne trade with the Levant.