Definition of "complication"

complication

noun
countable and uncountable, plural complications
1. The act or process of complicating.
2. The state of being complicated; intricate or confused relation of parts; complexity.
3. A person who doesn't fit in with the main scheme of things; an interloper.
4. (medicine) A disease or diseases, or adventitious circumstances or conditions, coexistent with and modifying a primary disease, but not necessarily connected with it.
5. (horology) A feature beyond basic time display in a timepiece.
  Quotations
  Obsessed, he was after a watch that contained the greatest number of complications in the boldest combinations in the smallest space imaginable.
  2013, Stacy Perman, A Grand Complication: The Race to Build the World's Most Legendary Watch, Simon and Schuster, page 35
  In their final year, each student must make their own watch with a complication—from a tourbillon to a chiming mode to having a date display.
  2023 May 28, Brian Ng, “Is one of these students the next Breguet?”, in FT Weekend, HTSI, page 43