open-ended vs permanent

open-ended

adj
  • Unrestricted by definite limits. 

  • Of a straight draw, made up of four consecutive cards, thus able to be completed by either of two ranks of card. 

  • Adaptable to change. 

  • Permitting a spontaneous or unstructured response. 

  • There will be an open-ended discussion. 

permanent

adj
  • Without end, eternal. 

  • Lasting for an indefinitely long time. 

noun
  • A card whose effects persist beyond the turn on which it is played. 

  • A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm. 

  • Given an n⨯n matrix a_ij,, the sum over all permutations 𝜋, of ∏ᵢ₌₁ⁿa_i𝜋(i). 

How often have the words open-ended and permanent occurred in a corpus of books? (source: Google Ngram Viewer )