chi-square

noun, often attributive
\ˈkī-ˈskwer \

Definition of chi-square 

: a statistic that is a sum of terms each of which is a quotient obtained by dividing the square of the difference between the observed and theoretical values of a quantity by the theoretical value

First Known Use of chi-square

1900, in the meaning defined above

Keep scrolling for more

Learn More about chi-square

Share chi-square

Statistics for chi-square

Look-up Popularity

Time Traveler for chi-square

The first known use of chi-square was in 1900

See more words from the same year

More from Merriam-Webster on chi-square

See words that rhyme with chi-square

Comments on chi-square

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

WORD OF THE DAY

a generally accepted meaning of a word

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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