Definition for non-return - Oxford Dictionaries Online (World English)

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	non-return (non-return) Pronunciation: /ˈnɒnrɪtəːn/ adjective permitting the flow of air or liquid in one direction only: a non-return valve		Nearby Words non-racial non-random non-rational non-reader non-refundable non-resident non-residential non-resistance non-restrictive non-return non-returnable non-rhotic non-rigid non-scene non-scheduled non-scientific non-secretor non-sectarian non-sexual