Late 19th century; earliest use found in Webster's Dictionary English Language. From post-classical Latin abdicabilis able to be renounced from classical Latin abdicāre + -bilis.
Definition of abdicable in US English:
abdicable
adjectiveˈabdɪkəbl
rare
Capable of being abdicated or renounced.
Origin
Late 19th century; earliest use found in Webster's Dictionary English Language. From post-classical Latin abdicabilis able to be renounced from classical Latin abdicāre + -bilis.