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This is a short lecture providing one of the foundational and essential concepts needed for a semester-long Philosophy of Language college/university course. The compositionality of language is that feature of language by which the meanings of whole sentences or phrases are composed out of the meanings of parts of those sentences (i.e., words). This might seem obvious, but it is the thing that allows human beings to generate and understand wholly new or novel sentences, and understand them the very first time they hear them.