adj

• (geometry) Of or related to projective geometry:
  "Hence the non-Euclidean angle is measured by one-half the logarithm of the cross-ratio of four rays. Although the Euclidean point of view has been adopted for simplicity, the final result, depending as it does only on the cross-ratio, is projective; it is therefore independent of the particular assumptions that the rays α and β are perpendicular and that the initial line bisects the angle between them."
• (geometry) Of or related to projective geometry:
• (algebra) In a technical sense, general (but not necessarily so general as to be free); involving such objects:
• (algebra) In a technical sense, general (but not necessarily so general as to be free); involving such objects:

noun

• (psychology) An assessment test that presents subjects with some sort of stimulus to which they react by projecting or imagining details.
  "The projectives suggested considerable difficulty with women and a conflict between sexual preoccupation and hostility."
• (mathematics) A projective member of a category.
  "By 2.2 we see that this is a full, contravariant imbedding, and by 2.3 the image of A in (A, G) is a generating set of small projectives."
• (linguistics) A statement about a conditional or potential state of affairs, as opposed to one about a situation that actually exists or existed.
  "There was no basis for expecting differences in the frequency of projectives or turnabouts as a function of partner."