Adjective

(en adjective)

clear, and having no uncertainty or ambiguity

* {{quote-journal

, year = 1965 , month = July , first = Donald , last = Knuth , coauthors = , title = On the Translation of Languages from Left to Right , journal = Information and Control , volume = 8 , issue = , url = http://www.cs.dartmouth.edu/~mckeeman/cs48/mxcom/doc/knuth65.pdf , pages = 707–639 , passage = }}

An LR(k'') grammar is clearly unambiguous''', since the definition
implies every derivation tree must have the same handle, and by induc-
tion there is only one possible tree. It is interesting to point out further-
more that nearly every grammar which is known to be '''unambiguous is
either an LR(''k'') grammar, or (dually) is a right-to-left translatable
grammar, or is some grammar which is translated using "both ends to-
ward the middle." Thus, the LR(''k ) condition may be regarded as the most
powerful general test for nonambiguity that is now available.

Adjective

(en adjective)

Seemingly or apparently valid, likely, or acceptable; credible: a plausible excuse.

*

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).

Obtaining approbation; specifically pleasing; apparently right; specious.

a plausible''' pretext; '''plausible''' manners; a '''plausible delusion

Using specious arguments or discourse. (rfv-sense)

a plausible speaker

(obsolete) Worthy of being applauded; praiseworthy; commendable; ready.

(Bishop Hacket)