1. chain reaction a series of chemical reactions in which the product of one is a reactant in the next
  2. corrections the social control of offenders through a system of imprisonment and rehabilitation and probation and parole
  3. conviction an unshakable belief in something without need for proof
  4. dictionary a reference book containing an alphabetical list of words
  5. chain reactor a nuclear reactor that uses controlled nuclear fission to generate energy
  6. infraction a violation of a law or rule
  7. instructions a manual explaining how to install or operate a device
  8. transactions a written account of what transpired at a meeting
  9. contraction the act of decreasing in size or volume or quantity or scope
  10. interaction mutual or reciprocal dealings or influence
  11. sanction official permission or approval
  12. convection transfer of heat caused by molecular motion in liquid or gas
  13. congregation the act of assembling
  14. interactional capable of acting on or influencing each other
  15. counteraction action intended to nullify the effects of some previous action
  16. addition reaction a chemical reaction in which one molecule is added to another
  17. abreaction (psychoanalysis) purging of emotional tensions
  18. connection a relation between things or events
  19. insurrection organized opposition to authority
  20. direction a line leading to a place or point