IPA: /pɛnˈʌltɪmə/
KK: /pɛnˈʌltɪmə/
The second to last syllable in a word or the second to last item in a series.
In the word 'banana', the penultima is 'na'.
Penultima → It is formed from "paene" (meaning almost) and "ultimus" (meaning last). The word refers to the second to last item in a sequence, as it is almost the last one.
Think of something that is 'almost' ('paene') the 'last' ('ultimus') — that's why penultima means the second to last.