well-formed

[wel-fawrmd]
adjective
  1. rightly or pleasingly formed: a well-formed contour.
  2. Linguistics. (of an utterance) conforming to the rules of a language; grammatical (opposed to ill-formed).

Origin of well-formed

First recorded in 1510–20
Related formswell-form·ed·ness [wel-fawr-mid-nis, -fawrmd-] /ˈwɛlˈfɔr mɪd nɪs, -ˈfɔrmd-/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for well-formedness

well-formed

adjective
  1. logic linguistics (of a formula, expression, etc) constructed in accordance with the syntactic rules of a particular system; grammatically correct
Derived Formswell-formedness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012