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Demand
Various quantities of a good or service that consumers are willing and able to buy at different possible prices during a particular time period, ceteris paribus.
Law of Diminishing Marginal Utility
As more of a good is consumed, the additional satisfaction (marginal utility) gained from each extra unit decreases, and so consumers will only buy more of the good if its price falls.
Marginal utility
The satisfaction obtained from consuming one more unit of a good or service.
The Law of Demand
The law of demand states that, as the price of a good increases, the quantity demanded decreases, ceteris paribus.
Utility
Utility is the satisfaction that a consumer receives by consuming a good/service.