OXFORD DICTIONARY
ocean, n.
1 a a large expanse of sea, esp. each of the main areas called the Atlantic, Pacific, Indian, Arctic, and Antarctic Oceans. b these regarded cumulatively as the body of water surrounding the land of the globe.
2 (usu. prec. by the) the sea.
3 (often in pl.) a very large expanse or quantity of anything (oceans of time).
ocean-going (of a ship) able to cross oceans. ocean tramp a merchant ship, esp. a steamer, running on no regular line or route.
oceanward adv. (also -wards).
ME f. OF occean f. L oceanus f. Gk okeanos stream encircling the earth's disc, Atlantic
THESAURUS
ocean
abundance, acres, bags, barrels, blue, brine, briny, bushel, copiousness, countlessness, deep, drink, flood, gobs, high seas, load, loads, lots, main, mass, mountain, much, multitude, numerousness, oceans, oodles, peck, plenitude, plenty, plethora, profusion, quantities, quantity, scads, sea, spate, superabundance, superfluity, the briny, the deep, the depths, tons, volume, world, worlds
ROGET THESAURUS
ocean
Ocean
N
sea,
ocean, main, deep, brine, salt water, waves, billows, high seas, offing, great waters, watery waste, vasty deep, wave, tide, hydrography, hydrographer, Neptune, Poseidon, Thetis, Triton, Naiad, Nereid, sea nymph, Siren, trident, dolphin, oceanic, marine, maritime, pelagic, pelagian, seagoing, hydrographic, bathybic, cotidal, at sea, on sea, afloat.