the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur
the activity of causing to have energy and be active
making active and effective (as a bomb)
stimulation of activity in an organism or chemical
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
forceful exertion
enterprising or ambitious drive
an imaginative lively style (especially style of writing)
a healthy capacity for vigorous activity
