Etymology
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mandamus (n.)

"writ from a superior court to an inferior court or officer specifying that something be done by the persons addressed, as being within their office or duty," 1530s (late 14c. in Anglo-French), from Latin mandamus "we order" (opening word of the writ), first person plural present indicative of mandare "to order" (see mandate (n.)). "Its use is generally confined to cases of complaint by some person having an interest in the performance of a public duty, when effectual relief against its neglect cannot be had in the course of an ordinary action" [Century Dictionary]. 

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Definitions of mandamus

mandamus (n.)
an extraordinary writ commanding an official to perform a ministerial act that the law recognizes as an absolute duty and not a matter for the official's discretion; used only when all other judicial remedies fail;
Synonyms: writ of mandamus
From wordnet.princeton.edu