(computing, slang) Multiple computers (occasionally a single computer), especially those running UNIX.
noun
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Origin of boxen
A nonstandard plural of box formed by analogy with oxen. The standard plural of box is boxes; -en is no longer a plural in standard use. See -en for details.
From
Wiktionary
From Middle English boxen, replacing earlier bixen, from Old English byxen (“made of boxwood”), equivalent to box + -en.