GNU Collaborative International Dictionary of English

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Found one definition

1.       
   northbound adj.
   1. Moving toward the north; as, “northbound traffic”.
   
   Syn. -- northward.
   
   [WordNet 1.5]
   
   
   2.  intended to be used by vehicles moving toward the north; -- of roads and parts of roads; as, “The northbound lane was blocked by an overturned tractor-trailer”.
   
   [PJC]