1. connected sequence of events: a series of events following on quickly from each other, each of which causes the next one
2. nuclear physics self-sustaining nuclear fission: a self-sustaining nuclear reaction in which each fission of an atomic nucleus causes neutrons and energy to be emitted, each collision of neutrons with other nuclei causing a further fission
3. chemistry series of chemical reactions: a series of chemical reactions in which the product from one reaction helps to create the next one
