Meaning of Pentagonian in English:

Pentagonian

Pronunciation /ˌpɛntəˈɡəʊnɪən/

adjective

US
  • Of or relating to the Pentagon, or the United States Department of Defense; characteristic of the Pentagon or its occupants.

noun

US
  • A person who works for the United States Department of Defense (in the Pentagon).

Origin

Late 16th century (in an earlier sense). From pentagon + -ian.