A metric unit of energy equal to one quintillion (10^18) joules. Its symbol is EJ. It is used in macro-level energy economics and geophysics to measure national or global energy consumption, seismic events, or planetary energy budgets. One exajoule is roughly equivalent to the energy content of one quadrillion BTUs.
Heard on the job
The country's annual primary energy consumption dropped by half an exajoule last year.