Meaning & use
nonagonal
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Meaning
adjectivebefore a nountechnicalmathematics
Having nine straight sides and nine angles, like a nine-sided polygon.
Grammar: Usually comes before a noun: a nonagonal shape. It is not used after a verb like 'be' in everyday speech.
Patterns
- nonagonal shape
- nonagonal figure
- nonagonal design
The tiles formed a nonagonal pattern on the floor.
A nonagonal figure has nine sides and nine angles.
The architect drew a nonagonal room for the exhibition.
Common combinations
- nonagonal shape
- The mirror was cut into a nonagonal shape.
- nonagonal figure
- In geometry class we learned how to draw a nonagonal figure.
- nonagonal pattern
- The quilt had a repeating nonagonal pattern.
Synonyms and how they differ
- nine-sided
- More everyday and descriptive; use it when you do not need the technical term.
- enneagonal
- A rarer technical synonym from Greek roots; it means the same but is less common.
Word family
- nonagon noun
- A nine-sided polygon.
Commonly confused: nonagonal or nonagon?
nonagonal vs nonagon
Nonagon is the noun (the shape itself); nonagonal is the adjective (describing something with that shape).
Practice
Which sentence uses 'nonagonal' correctly?
Choose one answer.
Nonagonal means having nine sides. The other options give the wrong number of sides, so they do not match the meaning of the word.
Make it your own
Write a sentence using “nonagonal”, then check it and compare it with the examples above.