Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • 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.

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

Etymologies

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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