secretary of transportation is a noun meaning "the person who holds the secretaryship of the Department of Transportation". It carries 2 recorded senses.
the person who holds the secretaryship of the Department of Transportation
“Johnson appointed Alan S. Boyd as the first Transportation Secretary”
the position of the head of the Department of Transportation
“the post of Transportation Secretary was created in 1966”
Definitions, synonyms and semantic relations for secretary of transportation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.