co·​pla·​nar | \ (ˌ)kō-ˈplā-nər How to pronounce coplanar (audio) , -ˌnär \

Definition of coplanar

: lying or acting in the same plane

Keep scrolling for more

Other Words from coplanar

coplanarity \ ˌkō-​plā-​ˈner-​ə-​tē How to pronounce coplanarity (audio) , -​ˈna-​rə-​ \ noun

Examples of coplanar in a Sentence

Recent Examples on the Web In their study, Müller and his team argue that if coplanar alignments of dwarf galaxies are widespread, this would pose a worthy challenge to the LCDM model—which predicts a random distribution of dwarfs. Shannon Stirone, Scientific American, "Dancing Dwarf Galaxies Deepen Dark Matter Mystery," 1 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'coplanar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of coplanar

1853, in the meaning defined above

Keep scrolling for more

Learn More about coplanar

Time Traveler for coplanar

Time Traveler

The first known use of coplanar was in 1853

See more words from the same year

Statistics for coplanar

Cite this Entry

“Coplanar.” Dictionary, Merriam-Webster, Accessed 7 Jul. 2020.

More from Merriam-Webster on coplanar

Rhyming Dictionary: Words that rhyme with coplanar

Comments on coplanar

What made you want to look up coplanar? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

A More Exception(al) Quiz

  • hot dog  hot dog  hot dog  hot dog cat
  • Which of the following words is not a synonym for ‘a young person’?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!