Definition of "plausible"

In short, the twin assumptions that syntactic rules are category-based, and that there are a highly restricted finite set of categories in any natural language (perhaps no more than a dozen major categories), together with the assumption that the child either knows (innately) or learns (by experience) that all rules are structure-dependent ( =category-based), provide a highly plausible model of language acquisition, in which languages become learnable in a relatively short, finite period of time (a few years).

1988, Andrew Radford, Transformative Grammar: A First Course, Cambridge, UK: Cambridge University Press, page 64

capable of receiving a plauſible Anſwer

1693, John Hacket, Scrinia reserata: a Memorial offered to the great Deservings of John Williams

[…] a coachman named Richard, who was described as a "sensible, well-behaved yellow boy, who is plausible and can read and write."

1955, William H. Townsend, Lincoln and the Bluegrass: Slavery and Civil War in Kentucky