‘lubricant’ means a preparation consisting of base fluids and additives;

‘base fluid’ means a lubricating fluid whose flow, ageing, lubricity and anti-wear properties, as well as its properties regarding contaminant suspension, have not been improved by the inclusion of additives;

‘thickener’ means a substance in the base fluid used to thicken or modify the rheology of a lubricating fluid or grease;

‘main component’ means any substance accounting for more than 5 % by weight of the lubricant;

‘additive’ means a substance whose primary functions are the improvement of the flow, ageing, lubricity, anti-wear properties or of contaminant suspension;

‘grease’ means a solid to semi-solid preparation which consists of a thickening agent in a liquid lubricant.