The movement of a dendritic cell in response to an external stimulus. [ http://www.ncbi.nlm.nih.gov/pubmed/16056255 http://www.ncbi.nlm.nih.gov/pubmed/15814331 http://openisbn.com/search.php?q=0781735149&isbn=1/ http://purl.obolibrary.org/obo/CL_0000451 GOC:add ]