convolution

noun7

1. •
   A twist or fold.
2. •
   Any of the folds on the surface of the brain.
3. •
   One 360° turn in a spring or similar helix.
4. •
   The state or condition of being convoluted.
5. •
   A mathematical operation on two functions that produces a third that expresses how the shape of one is modified by the other; the integral of the product of the two functions after one is reflected about the y-axis and shifted along the x-axis.

   • Linear convolution is one of the most frequent computations carried out in digital signal processing (DSP). — 1997
6. •
   The shape of something rotating; a vortex.
7. •
   A function which maps a tuple of sequences into a sequence of tuples.