Definition of grapheme noun from the Oxford Advanced Learner's Dictionary

 

grapheme

 noun
noun
BrE BrE//ˈɡræfiːm//
 
; NAmE NAmE//ˈɡræfiːm//
 
(linguistics)
 
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the smallest unit that has meaning in a writing system compare phoneme Word Origin 1930s: from graph ‘a visual symbol representing a unit of sound or other feature of speech’ + -eme.
See the Oxford Advanced American Dictionary entry: grapheme