The Collaborative International Dictionary of English v.0.48:

Commorant \Com"mo*rant\, n. [L. commorans, p. pr. of commorari
   to abide; com- + morari to delay.]
   1. (Law) Ordinarily residing; inhabiting.
      [1913 Webster]

            All freeholders within the precinct . . . and all
            persons commorant therein.            --Blackstone.
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   2. (Am. Law) Inhabiting or occupying temporarily.
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The Collaborative International Dictionary of English v.0.48:

Commorant \Com"mo*rant\, n.
   A resident. --Bp. Hacket.
   [1913 Webster]

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

COMMORANT. One residing or inhabiting a particular place. Barnes, 162.