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react
verb
to
do
or
say
something
because
of
what
has
happened
or
what
someone
else
has
done
or
said
•
When
the
fire
alarm
rang
,
all
the
students
reacted
quickly
and
left
the
building
.
When
the
fire
alarm
rang
,
all
the
students
reacted
quickly
and
left
the
building
.
•
He
didn't
know
how
to
react
when
he
got
the
surprising
news
.
He
didn't
know
how
to
react
when
he
got
the
surprising
news
.
From
Latin
re-
"
again
"
+
agere
"
to
do
,
drive
",
via
French
réagir
.
verb
(
chemistry
)
to
change
and
form
something
new
when
mixed
with
another
substance
•
Vinegar
and
baking
soda
react
to
make
bubbles
of
gas
.
Vinegar
and
baking
soda
react
to
make
bubbles
of
gas
.
•
Iron
reacts
with
oxygen
and
forms
rust
over
time
.
Iron
reacts
with
oxygen
and
forms
rust
over
time
.
Same
origin
as
sense
1
;
the
scientific
use
developed
in
the
19th
century
as
chemistry
advanced
.
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