rejoin (v.1) Look up rejoin at Dictionary.com
"join again," 1540s, from re- "again" + join (v.).
rejoin (v.2) Look up rejoin at Dictionary.com
"to answer," mid-15c., legal term, from Middle French rejoin-, stem of rejoindre "to answer to a legal charge," from Old French re- "back" (see re-) + joindre "to join" (see join). General (non-legal) meaning first recorded 1630s.