[Latin, We comand.] A writ or order that is issued from a court of superior jurisdiction that commands an inferior tribunal, corporation, Municipal Corporation, or individual to perform, or refrain from performing, a particular act, the performance or omission of which is required by law as an obligation.
A writ or order of mandamus is an extraordinary court order because it is made without the benefit of full judicial process, or before a case has concluded. It may be issued by a court at any time that it is appropriate, but it is usually issued in a case that has already begun.
Generally, the decisions of a lower-court made in the course of a continuing case will not be reviewed by higher courts until there is a final judgment in the case. On the federal level, for example, 28 U.S.C.A. § 1291 provides that appellate review of lower-court decisions should be postponed until after a final judgment has been made in the lower court. A writ of mandamus offers one exception to this rule. If a party to a case is dissatisfied with some decision of the trial court, the party may appeal the decision to a higher court with a petition for a writ of mandamus before the trial proceeds. The order will be issued only in exceptional circumstances.
https://legal-dictionary.thefreedictionary.com/writ+of+mandamus
In Spanish, it is ‘mandamos” (we command- present tense). Thx for that.