allegeable
/əˈlɛdʒəbl/(also allegible)
adjective
Capable of being submitted as evidence, or given as a reason or excuse for something. Also: (of an author, text, or passage) capable of being cited or quoted as an authority. Now rare.
Origin
Mid 16th century; earliest use found in Henry VIII (1491–1547), king of England and Ireland. From allege + -able, probably after either Anglo-Norman alleggeable or post-classical Latin allegabilis.