Here is a context clues worksheet on the noun phalanx. It means “a body of heavily armed infantry in ancient Greece formed in close deep ranks and files; broadly, a body of troops in close array,” “a massed arrangement of persons, animals, or things,” and “an organized body of persons.”
The context for this document frames the latter two definitions. This is not a commonly used word, but it does turn up in various places–often in a constructions (as Merriam-Webster’s has it) like “a phalanx of lawyers.”
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