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Energy
Definitions
(2)
1
noun
The
capacity
to
do
work
or
produce
change
,
often
measured
in
joules
or
calories
.
The
solar
panels
convert
sunlight
into
energy
.
She
felt
a
surge
of
energy
after
her
morning
coffee
.
The
battery
stores
energy
for
later
use
.
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2
noun
Vitality
or
enthusiasm
,
often
used
to
describe
a
person's
liveliness
or
spirit
.
He
is
full
of
energy
and
always
ready
for
an
adventure
.
Her
energy
lights
up
the
room
.
The
children
have
so
much
energy
after
eating
sweets
.
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Word Origin
Language
Greek
Original word
enérgeia
Word parts
en (in) + érgon (work)
Originally meant
activity or operation
Background
The term 'energy' was first used in the context of physics in the 19th century, but its roots go back to ancient Greek philosophy, where it described the active state of being.