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Medium also refers to an average or mean in a range of sizes or conditions. Usually, the term is used when there are only a few different sizes in the range, rather than many. For example, items such as drinks at a fast food restaurant might come in three sizes: Small, Medium, and Large.
A footnote: the peculiarities of the English language, and its redundant use of the same words for different things, allows English speakers to make such statements as "Small medium at large!" that are both comprehensible and mildly amusing.