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radical
adjective
(
informal
,
slang
)
excellent
,
impressive
,
or
very
cool
•
"
That
skateboard
trick
was
radical
!"
shouted
the
teenager
.
"
That
skateboard
trick
was
radical
!"
shouted
the
teenager
.
•
My
older
brother
says
the
1980s
music
scene
was
totally
radical
.
My
older
brother
says
the
1980s
music
scene
was
totally
radical
.
Slang
sense
emerged
in
U
.
S
.
youth
culture
during
the
late
1970s
surfing
and
skateboarding
scenes
,
using
“
radical
”
to
praise
daring
moves
.
adjective
describing
a
change
,
idea
,
or
action
that
is
extremely
different
from
what
existed
before
and
thoroughly
transforms
something
•
The
company
introduced
a
radical
new
design
that
surprised
all
its
customers
.
The
company
introduced
a
radical
new
design
that
surprised
all
its
customers
.
•
After
months
of
debate
,
the
city
council
approved
radical
reforms
to
the
school
system
.
After
months
of
debate
,
the
city
council
approved
radical
reforms
to
the
school
system
.
From
Late
Latin
radicalis
“
of
or
pertaining
to
a
root
,”
from
Latin
radix
“
root
.”
The
sense
of
"
thorough
,
fundamental
"
developed
in
English
in
the
late
14th
century
.
noun
the
√
sign
or
an
expression
containing
a
root
in
mathematics
,
such
as
√7
•
In
her
homework
,
Mia
forgot
to
write
the
radical
above
the
number
16
.
In
her
homework
,
Mia
forgot
to
write
the
radical
above
the
number
16
.
•
The
teacher
explained
how
to
simplify
a
radical
by
factoring
the
number
inside
.
The
teacher
explained
how
to
simplify
a
radical
by
factoring
the
number
inside
.
Mathematical
use
dates
from
the
17th
century
,
calling
the
root
symbol
‘
radical
sign
’
because
roots
in
Latin
are
radices
.
noun
a
person
who
holds
or
supports
extreme
political
or
social
views
and
wants
complete
change
•
The
young
radical
organized
nationwide
protests
demanding
climate
action
.
The
young
radical
organized
nationwide
protests
demanding
climate
action
.
•
Many
considered
the
novelist
a
radical
for
her
outspoken
feminist
ideas
.
Many
considered
the
novelist
a
radical
for
her
outspoken
feminist
ideas
.
Political
sense
arose
in
late
18th-century
Britain
,
where
Reformers
seeking
‘
radical
’
change
in
Parliament
were
called
Radicals
.