1. On a ship, train, plane or other vehicle
   - aboard

Encyclopedia: On board

• retrace
• retract
• retractable
• retracted
• retractile
• retraction
• retractor
• retrain
• retraining
• retral
• retranslate
• retransmit
• retread
• retreat
• retreatant
• retreated
• retrench
• retrenchment
• retrial
• retribution
• retributive
• retributory
• retrievable
• retrieval
• retrieve