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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
.
