activation energy

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WordNet Dictionary
	Definition:		[n]  the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
	See Also:		energy
Biology Dictionary
	Definition:		The amount of energy (expressed in joules) that is needed to convert all the molecules in one mole of a reacting substance from a ground state to the transition state.
	Synonyms:		&#144 G, delta G