In chemistry, activation energy is a term introduced in 1889 by the Swedish scientist Svante Arrhenius to describe the minimum energy which must be available to a chemical system with potential reactants to result in a chemical reaction.
Links
[1] https://hootsgo.org/?q=node/6468
[2] http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch22/activate.html