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Malcolm X occupied himself in jail by reading the dictionary, a pursuit resulting in his acquisition of a tremendous amount of knowledge embodied in an enormous vocabulary. One has only to turn to the pages of a dictionary to see why this is the case. For example, on page 317 of the American Heritage Dictionary, we find everything from continental code (which is defined as a form of Morse Code, minus dots and dashes, used outside North America) to contract (which is defined in numerous ways depending on whether it is used as a noun or verb).
In between, we discover that continents, having shifted over time, contain geographical features including elevations from which their river systems originate, and slopes that become submerged, first gradually and then precipitously, at that point where the continent meets the ocean and then drops to meet the ocean floor. On just one page, the same page, we also learn something about math, education, morphology, music, birth control – and on and on. As a source of knowledge, the dictionary is invaluable.
What is the dictionary is an invaluable source of knowledge?