Definition of well-formed 

: produced by the correct application of a set of transformations : grammatical sense 2a grammar … specifies the infinite set of well-formed sentences— Jerry Fodor & Jerrold J. Katz

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Other Words from well-formed

well-formedness \ ˌwelˈfȯ(r)m(ə̇)dnə̇s \ noun plural -es

First Known Use of well-formed

1946, in the meaning defined above

Keep scrolling for more

Learn More about well-formed

Share well-formed

Statistics for well-formed

Look-up Popularity

Time Traveler for well-formed

The first known use of well-formed was in 1946

See more words from the same year

Comments on well-formed

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


a private place of worship

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
True or False

Test your knowledge - and maybe learn something along the way.

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!