the act of making definite, distinct, or clear; a defining: We need a better definition of her responsibilities.
the formal statement of the meaning or significance of a word, phrase, idiom, etc., as found in dictionaries. An online dictionary resource, such as, 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.
the condition of being definite, distinct, or clearly outlined: His biceps have great muscle definition.
Optics. sharpness of the image formed by an optical system.
Radio and Television. the accuracy of sound or picture reproduction.

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

definitional, adjective
definitionally, adverb
predefinition, noun
redefinition, noun
self-definition, noun
subdefinition, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
definition (ˌdɛfɪˈnɪʃən)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "setting of boundaries," from O.Fr. definicion, from L. definitionem, noun of action from definire (see define). In logic, meaning "act of stating what something means" is from 1640s; meaning "a statement of the essential nature of something" is from late 14c.;
special focus on words developed after c.1550. Meaning "degree of distinctness of the details in a picture" is from 1889.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The formal definition of a limit is defined with the ideas of "greater
  than" or "less than".
Have the class come up with a definition of migration.
In truth, there is no universally accepted definition of the term.
Clips can be shot in both high definition and standard definition.
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