from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Extending outward; projecting.
  • adj. Relating to or made by projection.
  • adj. Mathematics Designating a property of a geometric figure that does not vary when the figure undergoes projection.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. projecting outward
  • adj. of, relating to, or caused by a projection
  • adj. describing those properties of a figure that are invariant upon projection

from The Century Dictionary and Cyclopedia

  • Produced by projection.
  • In geometry, relating to incidences and coincidences; not metrical: as, a projective theorem or property.
  • Capable, as two plane figures, of being derived from one another by a number of projections and sections.


from Wiktionary, Creative Commons Attribution/Share-Alike License

Formed by the suffixation of prōiect- (the perfect passive participial stem of the Classical Latin prōiciō, whence the English verb project) with the English -ive; however, compare the post-Classical Latin prōiectīvus ("relating to purging").



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