Unidirectional.
Single, simple; not complex.
A monomorphemic word, one without affixes.
An analogue in a space of arbitrary dimensionality of the triangle or tetrahedron; the convex hull of n+1 linearly independent points in n-dimensional space; in other words, the triangle, tetrahedron etc., generalized to an arbitrary number of dimensions.
Unequivocal; indubitable.
Containing instances of only one vowel; univocalic.
Having unison of sound, as the octave has in music.
Having only one possible meaning.
Having always the same drift or tenor; uniform; certain; regular.
A document containing instances of only one vowel.
A word having only one meaning.