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engine
noun
a
machine
that
converts
fuel
,
electricity
,
or
another
form
of
energy
into
movement
to
power
a
vehicle
,
machine
,
or
device
•
The
car's
engine
roared
to
life
as
Mia
turned
the
key
.
The
car's
engine
roared
to
life
as
Mia
turned
the
key
.
•
The
airplane's
engine
hummed
steadily
during
the
long
flight
.
The
airplane's
engine
hummed
steadily
during
the
long
flight
.
From
Middle
English
engyn
,
from
Old
French
engin
"
skill
,
clever
device
",
from
Latin
ingenium
"
innate
quality
,
talent
".
Sense
shifted
to
mechanical
device
in
the
late
Middle
Ages
.
noun
the
powered
vehicle
at
the
front
or
rear
of
a
train
that
pulls
or
pushes
the
carriages
•
The
sleek
blue
engine
pulled
into
the
station
,
hissing
steam
.
The
sleek
blue
engine
pulled
into
the
station
,
hissing
steam
.
•
Children
waved
as
the
old
steam
engine
chugged
past
the
crossing
.
Children
waved
as
the
old
steam
engine
chugged
past
the
crossing
.
Extension
of
the
general
sense
"
mechanical
device
"
to
the
specific
railway
vehicle
in
the
early
19th
century
,
with
the
spread
of
steam
locomotives
.
noun
the
core
software
component
that
carries
out
the
main
processing
or
calculation
tasks
in
a
larger
computer
program
or
system
•
The
game
’
s
physics
engine
calculates
how
objects
should
move
and
collide
.
The
game
’
s
physics
engine
calculates
how
objects
should
move
and
collide
.
•
Google
’
s
search
engine
indexes
billions
of
web
pages
every
day
.
Google
’
s
search
engine
indexes
billions
of
web
pages
every
day
.
By
metaphorical
extension
from
mechanical
engine
to
describe
the
“
driving
”
part
of
software
in
the
late
20th
century
.
noun
a
person
or
thing
that
drives
,
powers
,
or
motivates
an
activity
,
organization
,
or
process
•
Passionate
volunteers
were
the
real
engine
of
the
charity
’
s
success
.
Passionate
volunteers
were
the
real
engine
of
the
charity
’
s
success
.
•
Innovation
is
the
engine
that
keeps
the
tech
industry
moving
forward
.
Innovation
is
the
engine
that
keeps
the
tech
industry
moving
forward
.
Figurative
use
developing
from
the
idea
of
an
engine
as
the
part
that
provides
power
,
first
recorded
in
the
19th
century
.
noun
(
archaic
)
a
mechanical
device
,
contrivance
,
or
weapon
designed
to
achieve
a
particular
purpose
,
especially
in
warfare
or
siege
•
The
castle
defenders
dreaded
the
enemy
’
s
new
siege
engine
.
The
castle
defenders
dreaded
the
enemy
’
s
new
siege
engine
.
•
He
wrote
of
clever
engines
that
could
breach
any
fortress
wall
.
He
wrote
of
clever
engines
that
could
breach
any
fortress
wall
.
Old
sense
found
in
Middle
English
and
Early
Modern
English
literature
,
where
"
engine
"
referred
to
any
ingenious
device
or
weapon
.