doubling

noun4

1. •
   The process or an instance of making something double; a multiplication by two.

   • Similitude applies to proportional changes, such as doublings, halvings, or quarterings; it does not apply to additive changes. — 1994
2. •
   The act of turning around, or doubling back.
3. •
   A pleat or fold.
4. •
   (no longer used) A trick; double-dealing.