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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
a dictionary definition2 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.
by definition
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
technologies such as high definition televisiongood muscle definition
