Meaning of reversible reaction

revers'ible reac'tion

Pronunciation: [key]
— Chem. Chem.
  1. a reaction that, depending on ambient conditions, can proceed in either of two directions: the production of the reaction products from the reactants, or the production of the original reactants from the formed reaction products. Cf.(def. 4).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.