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invasion
noun
the
act
of
an
armed
force
entering
another
country
or
area
in
order
to
take
control
by
force
•
The
soldiers
prepared
to
defend
the
city
against
an
invasion
from
the
north
.
The
soldiers
prepared
to
defend
the
city
against
an
invasion
from
the
north
.
•
History
books
describe
the
Norman
invasion
of
England
in
1066
.
History
books
describe
the
Norman
invasion
of
England
in
1066
.
Late
Middle
English
,
from
Latin
invasio
(
n-
),
from
invadere
‘
to
go
into
,
attack
’.
noun
a
sudden
and
unwelcome
arrival
of
many
people
,
animals
,
or
things
that
crowd
into
a
place
or
situation
•
Every
summer
our
quiet
beach
town
faces
an
invasion
of
tourists
looking
for
sun
.
Every
summer
our
quiet
beach
town
faces
an
invasion
of
tourists
looking
for
sun
.
•
An
invasion
of
ants
covered
the
kitchen
counter
overnight
.
An
invasion
of
ants
covered
the
kitchen
counter
overnight
.
Extended
sense
of
the
military
meaning
,
first
recorded
in
the
18th
century
.
noun
the
spread
of
disease-causing
organisms
or
cancer
cells
into
surrounding
tissues
of
the
body
•
Doctors
explained
that
cancer
invasion
into
nearby
tissue
makes
the
disease
harder
to
treat
.
Doctors
explained
that
cancer
invasion
into
nearby
tissue
makes
the
disease
harder
to
treat
.
•
The
microscope
slide
showed
bacterial
invasion
of
the
wound
.
The
microscope
slide
showed
bacterial
invasion
of
the
wound
.
Adopted
in
medical
writing
in
the
late
19th
century
to
describe
how
harmful
cells
or
organisms
move
into
healthy
tissue
.
