noun, often capitalized, often attributive
\ ˈjā How to pronounce j (audio) \
plural j's or js\ ˈjāz How to pronounce j (audio) \

Definition of j

 (Entry 1 of 3)

1a : the 10th letter of the English alphabet
b : a speech counterpart of orthographic j (as j in jump)
2a : a graphic device for reproducing the letter j
b : a unit vector parallel to the y-axis
3 : one designated j especially as the 10th in order or class
4 : something shaped like the letter J
5 J, plural J's or Js, basketball, informal : jump shot … she flicked a pass to the corner, where Lawson nailed a J to tie the game at 51.— Hank Hersch

Definition of j (Entry 2 of 3)

1 jack
2 journal
3 judge; justice

Definition of J (Entry 3 of 3)


Examples of j in a Sentence

Noun a word that begins with a j a word that begins with j

First Known Use of j


15th century, in the meaning defined at sense 1a

Keep scrolling for more

Learn More about j

Time Traveler for j

Time Traveler

The first known use of j was in the 15th century

See more words from the same century

Statistics for j

Cite this Entry

“J.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/j. Accessed 13 Apr. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for j



English Language Learners Definition of j

: the 10th letter of the English alphabet


noun, often capitalized
\ ˈjā How to pronounce j (audio) \
plural j's or js\ ˈjāz \

Kids Definition of j

: the tenth letter of the English alphabet



Medical Definition of J

mechanical equivalent of heat

Keep scrolling for more

Legal Definition of J.

1 judge
2 justice
3 judgment

More from Merriam-Webster on j

Nglish: Translation of j for Spanish Speakers

Comments on j

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


Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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