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For other uses, see Seine (disambiguation). The Seine (/seÉªn/ SAYN; French: La Seine, pronounced: [la sÉËn]) is a 777-kilometre-long (483 mi) river and an important commercial waterway within the Paris Basin in the north of France.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  seine(Noun) A long net having floats attached at the top and sinkers (weights) at the bottom, used in shallow water for catching fish. 2  seine(Verb) To use a seine, to fish with a seine.