noun

1. A word having only one meaning.

2. A document containing instances of only one vowel.

adjective

1. Having only one possible meaning.

2. Containing instances of only one vowel; univocalic.

3. Having unison of sound, as the octave has in music.

Synonyms: definite, monosemous, unambiguous, unequivocal, self-evident, undoubtable