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

  • adj. Conveying knowledge or information; enlightening.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. conveying knowledge, information or instruction.
  • n. A case in the Finnish language. It expresses the means or the instrument used to perform an action.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Conveying knowledge; serving to instruct or inform.

from The Century Dictionary and Cyclopedia

  • Serving to instruct or inform; conveying knowledge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. serving to instruct or enlighten or inform


instruct + -ive (Wiktionary)



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