English Explanatory Dictionary

pentagon

English dictionary entry

Meanings

noun
  1. A polygon with five sides and five angles.
  2. A fort with five bastions.
name
  1. The headquarters of the United States Department of Defense.
  2. The United States Department of Defense.

Pronunciation

pĕn'təgän /ˈpɛn.təˌɡɑn/ pĕn'təgən pĕn'təgŏn /ˈpɛn.tə.ɡən/ /ˈpɛn.tə.ɡɒn/ en-ca-pentagon.oga /ˈpɛntəɡɑn/ /ˈpɛntəɡən/

Word forms

pentagon pentagons the Pentagon

Etymology

From Middle French pentagone, from Late Latin pentagōnum, from Ancient Greek πεντάγωνον (pentágōnon), noun use of the neuter of the adjective πεντάγωνος (pentágōnos, “five-angled”), from πέντε (pénte, “five”) + -γωνος (-gōnos, “angled”). Equivalent to penta- + -gon.

Synonyms

5-gon quinquangle Pentagram

Related words

pentagram quinquangle

Derived words

pentagonal pentagonoid pentagonous Pentagonese they hit the Pentagon
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