enrgy -
n. (pl. -ies)
1
force, vigour; capacity for activity.
2 (in pl.) individual powers in use (devote your energies to this).
3
Physics the capacity of matter or radiation to do work.
4 the means of doing work by utilizing matter or radiation.
[F ÷nergie or LL energia f. Gk energeia f. ergon work]