definitional

[def-uh-nish-uhn]

def·i·ni·tion

[def-uh-nish-uhn]
noun
1.
the act of defining or making definite, distinct, or clear.
2.
the formal statement of the meaning or significance of a word, phrase, idiom, etc., as found in dictionaries. An online dictionary resource, such as Dictionary.com, can give users direct, immediate access to the definitions of a term, allowing them to compare definitions from various dictionaries and stay up to date with an ever-expanding vocabulary.
3.
the condition of being definite, distinct, or clearly outlined.
4.
Optics. sharpness of the image formed by an optical system.
5.
Radio and Television. the accuracy of sound or picture reproduction.

Origin:
1350–1400; Middle English diffinicioun < Old French diffinition < Latin dēfīnītiōn- (stem of dēfīnītiō), equivalent to dēfīnīt(us) (see definite) + -iōn- -ion

def·i·ni·tion·al, adjective
def·i·ni·tion·al·ly, adverb
pre·def·i·ni·tion, noun
re·def·i·ni·tion, noun
self-def·i·ni·tion, noun
EXPAND
sub·def·i·ni·tion, noun
COLLAPSE
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Definitional is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
definition (ˌdɛfɪˈnɪʃən)
 
n
1.  a formal and concise statement of the meaning of a word, phrase, etc
2.  the act of defining a word, phrase, etc
3.  specification of the essential properties of something, or of the criteria which uniquely identify it
4.  the act of making clear or definite
5.  the state or condition of being clearly defined or definite
6.  a measure of the clarity of an optical, photographic, or television image as characterized by its sharpness and contrast
 
defi'nitional
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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