noun - the process of making a liquid weaker or less concentrated by adding water or another liquid
adjective - describing petrol that does not contain lead, which is less harmful to the environment and engines
noun - the act of forcing people to accept something such as a rule, law, tax, or belief
noun - people of high social rank who have titles such as duke, earl, or baron; the aristocracy
verb - to cause a chemical change in food or drink by the action of bacteria or yeast