The Collaborative International Dictionary of English v.0.48:

Procedendo \Pro`ce*den"do\, n. [Abl. of the gerundive of L.
   procedere. see Proceed.] (Law)
   (a) A writ by which a cause which has been removed on
       insufficient grounds from an inferior to a superior court
       by certiorari, or otherwise, is sent down again to the
       same court, to be proceeded in there.
   (b) In English practice, a writ issuing out of chancery in
       cases where the judges of subordinate courts delay giving
       judgment, commanding them to proceed to judgment.
   (c) A writ by which the commission of the justice of the
       peace is revived, after having been suspended. --Tomlins.
       Burrill.
       [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROCEDENDO, practice. A writ which issues where an action is removed from an
inferior to a superior jurisdiction by habeas corpus, certiorari or writ of
privilege, and it does not appear to such superior court that the suggestion
upon which the cause has been removed, is sufficiently proved; in which case
the superior court by this writ remits the cause to the court from whence it
came, commanding the inferior court to proceed to the final hearing and
determination of the same. See 1 Chit. R. 575; 2 Bl. R. 1060 1 Str. R. 527;
6 T. R. 365; 4 B. & A. 535; 16 East, R. 387.