liner2Pronunciation: /ˈlʌɪnə/Translate liner | into French | into German | into Italian | into Spanish Definition of liner noun a lining in a device, container, or other object, especially a removable one. the lining of a garment. (also cylinder liner) a replaceable metal sleeve placed within the cylinder of an engine, forming a durable surface to withstand wear from the piston. liner in other Oxford dictionaries Definition of liner in the US English dictionary