Adjective : a triangular prism.    From Dictionary.com. 

Take an allegedly paradigmatic non-dispositional property: triangularity.    From Wordnik.com.  [Dispositions] Reference

Far out on the water a shape could be seen, a hint of triangularity speaking of Foam Dancer's lateen sail.    From Wordnik.com.  [Conan The Unconquered]

It is found that in addition to suitable elongation, large triangularity has advantage for arriving at high beta value and obtaining high fusion power output.    From Wordnik.com.  [Think Progress » New Woodward Book Details Multiple Bush Cover-Ups Over Iraq] Reference

Obviously, what is wanted is a description according to which the brownness “goes with” the squareness, and the greenness “goes with” the triangularity.    From Wordnik.com.  [The Problem of Perception] Reference

There are some clear cases: fragility, solubility, irrascibility are dispositions, while massiveness and triangularity seem to be non-dispositional, or categorical.    From Wordnik.com.  [Dispositions] Reference

But triangularity is a quality of that in which it is present; it is however no longer triangularity as such, but the triangularity present in that definite object and modified in proportion to its success in shaping that object.    From Wordnik.com.  [The Six Enneads.] Reference

On this last, however, it may be remarked that triangularity and quadrangularity are not in themselves qualities, but there is quality when a thing is triangular by having been brought to that shape; the quality is not the triangularity but the patterning to it.    From Wordnik.com.  [The Six Enneads.] Reference

He saw the gap opening and widening between her central upper incisors, and the way her hair knotted and plaited itself into medusas, and the strange triangularity of her profile, which sloped outwards from her hairline to the tip of her nose, swung about and headed in an unbroken line inwards to her neck.    From Wordnik.com.  [The Satanic Verses]

There is an eternal and immutable morality, as whiteness is white, and blackness is black, and triangularity is triangular.    From Wordnik.com.  [The Destiny of the Soul A Critical History of the Doctrine of a Future Life] Reference

And having been forced to admit this universal, we find that it is no longer worth while to invent difficult and unplausible theories to avoid the admission of such universals as whiteness and triangularity.    From Wordnik.com.  [The Problems of Philosophy] Reference

Had some inscrutable decree of fate ordained and made it certain, -- with a certainty not to be disturbed, -- that no candidate could be returned to Parliament who would not assert the earth to be triangular, there would rise immediately a clamorous assertion of triangularity among political aspirants.    From Wordnik.com.  [The Prime Minister] Reference

Had some inscrutable decree of fate ordained and made it certain, — with a certainty not to be disturbed, — that no candidate would be returned to Parliament who would not assert the earth to be triangular, there would rise immediately a clamorous assertion of triangularity among political aspirants.    From Wordnik.com.  [The Prime Minister] Reference

There are thus associated with triangularity a manifestation (yielding the result three) and conditions of manifestation (having its corners.    From Wordnik.com.  [Dispositions] Reference

Does this apply to triangularity?.    From Wordnik.com.  [The Six Enneads.] Reference

(˜triangularity™, ˜solubility™.    From Wordnik.com.  [Properties] Reference