energy derived from the heat in the interior of the earth
(of a nuclear reaction) occurring with evolution or releasing of energy
of or relating to the heat in the interior of the earth
(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
the federal department responsible for maintaining a national energy policy of the United States; created in 1977
