adjective

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The part of speech that modifies a noun or other substantive by limiting, qualifying, or specifying and distinguished in English morphologically by one of several suffixes, such as -able, -ous, -er, and -est, or syntactically by position directly preceding a noun or nominal phrase.
• noun Any of the words belonging to this part of speech, such as white in the phrase a white house.
• adjective Adjectival.
• adjective Law Specifying the processes by which rights are enforced, as opposed to the establishing of such rights; remedial.
• adjective Not standing alone; derivative or dependent.

from The Century Dictionary.

• To make an adjective of; form into an adjective; give the character of an adjective to.
• Naming or forming an adjunct to a noun: as, an adjective name. Pertaining to an adjective: as, the adjective use of a noun. Added or adjected; additional.
• noun In grammar, a word used to qualify, limit, or define a noun, or a word or phrase which has the value of a noun; a part of speech expressing quality or condition as belonging to something: thus, whiteness is the name of a quality, and is a noun; white means possessing whiteness, and so is an adjective.
• noun A dependant or an accessory; a secondary or subsidiary part.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Added to a substantive as an attribute; of the nature of an adjunct.
• adjective Not standing by itself; dependent.
• adjective a color which requires to be fixed by some mordant or base to give it permanency.
• adjective Relating to procedure.
• noun (Gram.) A word used with a noun, or substantive, to express a quality of the thing named, or something attributed to it, or to limit or define it, or to specify or describe a thing, as distinct from something else. Thus, in phrase, “a wise ruler,” wise is the adjective, expressing a property of ruler.
• noun A dependent; an accessory.
• transitive verb rare To make an adjective of; to form or change into an adjective.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective obsolete Incapable of independent function.
• adjective grammar Adjectival; pertaining to or functioning as an adjective.
• adjective law Applying to methods of enforcement and rules of procedure.
• adjective chemistry Of a dye that needs the use of a mordant to be made fast to that which is being dyed.
• noun grammar A word that modifies a noun or describes a noun’s referent.
• verb transitive To make an adjective of; to form or convert into an adjective.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a word that expresses an attribute of something
• noun the word class that qualifies nouns
• adjective of or relating to or functioning as an adjective
• adjective relating to court practice and procedure as opposed to the principles of law