-ence BrE AmE ə n t s —The two possible stress-effects of this suffix are illustrated in ˌ corre ˈ spondence and ma ˈ levolence. In a few words it triggers a vowel change and shift of stress in the stem, as prevail prɪ ˈveɪ ə l ⇨ prevalence ˈprev ə l ən t s, confide kən ˈfaɪd ⇨ confidence ˈkɒn fɪd ə n t s . There is fluctuation in precedence, subsidence.
-ENCE
Meaning of -ENCE in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012