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reaction
noun
something
you
do
,
say
,
or
feel
because
something
else
has
happened
or
been
said
•
When
she
heard
the
surprise
news
,
her
first
reaction
was
to
laugh
.
When
she
heard
the
surprise
news
,
her
first
reaction
was
to
laugh
.
•
The
dog's
quick
reaction
saved
it
from
the
falling
branch
.
The
dog's
quick
reaction
saved
it
from
the
falling
branch
.
from
French
réaction
,
from
Late
Latin
reactio
,
from
re-
back
+
actio
action
noun
a
process
in
which
one
or
more
substances
change
into
new
substances
•
Rust
forming
on
iron
is
a
slow
chemical
reaction
.
Rust
forming
on
iron
is
a
slow
chemical
reaction
.
•
The
science
teacher
mixed
vinegar
and
baking
soda
to
show
a
bubbling
reaction
.
The
science
teacher
mixed
vinegar
and
baking
soda
to
show
a
bubbling
reaction
.
extended
scientific
sense
recorded
in
the
17th
century
as
chemistry
developed
noun
a
force
equal
in
size
and
opposite
in
direction
to
another
force
•
When
you
push
on
the
wall
,
the
wall
pushes
back
with
an
equal
reaction
.
When
you
push
on
the
wall
,
the
wall
pushes
back
with
an
equal
reaction
.
•
A
rocket
moves
upward
because
the
exhaust
gases
create
a
downward
reaction
.
A
rocket
moves
upward
because
the
exhaust
gases
create
a
downward
reaction
.
physics
sense
formalized
in
the
17th
century
by
Isaac
Newton
noun
strong
opposition
to
social
or
political
change
,
favoring
traditional
ideas
•
The
new
law
met
fierce
reaction
from
conservative
groups
.
The
new
law
met
fierce
reaction
from
conservative
groups
.
•
History
shows
that
progressive
movements
often
face
equal
and
opposite
reaction
.
History
shows
that
progressive
movements
often
face
equal
and
opposite
reaction
.
political
sense
arose
in
the
early
19th
century
after
the
French
Revolution
to
describe
forces
resisting
change