intension

noun4

1. •
   Intensity or the act of becoming intense.

   • Sounds […] likewise do rise and fall with the intension or remission of the wind. — 1627
2. •
   Any property or quality connoted by a word, phrase or other symbol, contrasted with actual instances in the real world to which the term applies.

   • 'Is a plant', 'has a trunk', 'has leaves' are intensions of the concept tree. Its extension is the set of all trees existing in the real world.
3. •
   Intensification.
4. •
   (old-fashioned) A straining, stretching, or bending; the state of being strained.