Definition of “pentagon” - English Dictionary

(Definition of “pentagon” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“pentagon” in American English

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pentagonnoun [ C ]

us /ˈpent·əˌɡɑn/

geometry a flat, five-sided shape with five angles

Pentagonnoun [ U ]

us /ˈpent·əˌɡɑn/

the building where the US Defense Department is based, or the US Defense Department itself

(Definition of “pentagon” from the Cambridge Academic Content Dictionary © Cambridge University Press)