Definition of antepenultimate adjective from the Oxford Advanced American Dictionary

 

antepenultimate

 adjective
adjective
NAmE//ˌæntipenˈʌltɪmət//
 
[only before noun](formal)
 
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two before the last; third last the antepenultimate item on the agenda
See the Oxford Advanced Learner's Dictionary entry: antepenultimate