Definitions for diacritical mark
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Princeton's WordNet
diacritical mark, diacritic(noun)
a mark added to a letter to indicate a special pronunciation
Wiktionary
diacritical mark(Noun)
A symbol in writing used with a letter to indicate a different pronunciation, stress, tone, or meaning, also called "tone marks" when used to indicate tones, e.g. in Vietnamese or pinyin (romanised Mandarin Chinese).
Origin: diacritical + mark
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"diacritical mark." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/diacritical mark>.