IPA: /dɛrˈnɪə/
KK: /dɛrˈnɪr/
Referring to the final item in a series or the most recent occurrence.
She was the dernier winner of the competition.
Dernier comes from Old French 'dernier' (meaning last or final). It is used to denote the last in a series or sequence.
Think of 'dernier' as meaning the 'last' in a series, helping you remember that it refers to something final.