noun

• The act or process of complicating.
• The state of being complicated; intricate or confused relation of parts; complexity.
• A person who doesn't fit in with the main scheme of things; an interloper.
• (medicine) A disease or diseases, or adventitious circumstances or conditions, coexistent with and modifying a primary disease, but not necessarily connected with it.
• (horology) A feature beyond basic time display in a timepiece.