Definition of penultimate adjective from the Oxford Advanced Learner's Dictionary

 

penultimate

 adjective
adjective
BrE BrE//penˈʌltɪmət//
 
; NAmE NAmE//penˈʌltɪmət//
 
[only before noun]
 
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immediately before the last one synonym next/second to last the penultimate chapter/day/stage Word Origin late 17th cent.: from Latin paenultimus, from paene ‘almost’ + ultimus ‘last’, on the pattern of ultimate.
See the Oxford Advanced American Dictionary entry: penultimate