IPA: /ˌdaɪəˈkrɪtɪkəl/
KK: /daɪəˈkrɪtɪkəl/
Relating to marks or signs that are used to indicate a difference in pronunciation or meaning of a word.
The diacritical marks in the text helped clarify the pronunciation of the foreign words.
Diacritical → It is formed from "dia-" (meaning through or across) and "kritikos" (from Greek, meaning able to judge or discern). The word "diacritical" refers to marks that help to distinguish or judge the pronunciation or meaning of words.
Think of marks that help you 'judge' or 'discern' the correct pronunciation or meaning of words, as 'dia-' means through and 'kritikos' relates to judging.