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)

Open to multiple interpretations.

The politician was criticized for his ambiguous statements and lack of precision.

Vague and unclear.

He gave an ambiguous answer.

(obsolete, of persons) Hesitant; uncertain; not taking sides.

* 1662 (Thomas Salusbury)

And forasmuch as in this same question I am ambiguous , and Simplicius is resolute....