chain reaction

noun3

1. •
   A chemical reaction where the products of the reaction influence the reactants of a following reaction, leading to positive feedback.
2. •
   A nuclear reaction in which particles produced by the fission of one atom trigger fissions of other atoms.

   • The Manhattan Project produced the first recorded controlled chain reaction.
3. •
   (figurative) A series of events, each one causing or influencing the next.

   • You need the evening action / A place to dine, a glass of wine, a little late romance / It's a chain reaction / You'll see the people of the world coming out to dance — 1980