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definition

noun
     
def‧i‧ni‧tion S3 W2
1 [countable] a phrase or sentence that says exactly what a word, phrase, or idea means [↪ define]:
a dictionary definition
definition of
There are many definitions of the word 'feminism'.
definition of something as something
the definition of God as infinite
2

by definition

if something has a particular quality by definition, it must have that quality because all things of that type have it:
People say that students are by definition idealistic and impatient.
3 [uncountable] the clear edges, shapes, or sound that something has:
technologies such as high definition television
good muscle definition

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