pentagon

B2 Topic:Describing Qualities

US /ˈpɛn.təˌɡɑn/ UK /ˈpɛn.tə.ɡən/ See IPA manual

Freq #8200

Meanings

1

noun
A flat shape with five straight sides and five angles.

The pupils drew a pentagon in their geometry exercise.
2

name
The headquarters of the US Department of Defense, or the department itself.

The Pentagon announced new measures to strengthen security.

Thesaurus

Synonyms

quinquangle

Word family

Forms pentagons

Derived forms pentagonalpentagonoidpentagonous

Related forms pentagramquinquangle

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.

pentagone Middle French pentagōnum la-lat πεντάγωνον Ancient Greek

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# pentagon

**Type:** Word
**Level:** B2
**Part of speech:** noun, name
**IPA (US):** /ˈpɛn.təˌɡɑn/
**IPA (UK):** /ˈpɛn.tə.ɡən/
**Frequency rank:** 8200

## Meanings
1. A flat shape with five straight sides and five angles.
2. The headquarters of the US Department of Defense, or the department itself.

## Examples
- The pupils drew a pentagon in their geometry exercise.
- The Pentagon announced new measures to strengthen security.

## Synonyms
- quinquangle

## Derived Forms
- pentagonal
- pentagonoid
- pentagonous

## Related Forms
- pentagram
- quinquangle

## Roots and Affixes
- Root: pentagone
- Root: pentagōnum
- Root: πεντάγωνον
- Affix: penta- - five

## 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.

## AI Etymology
Pentagon comes 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. In present-day English it covers a flat shape with five straight sides and five angles and the headquarters of the US Department of Defense, or the department itself. The wider family includes derived forms such as pentagonal, pentagonoid, pentagonous and related forms such as pentagram, quinquangle.

## Topics
- Describing Qualities

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pentagon

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