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domain
noun
a
particular
field
of
activity
,
knowledge
,
or
interest
•
The
new
software
engineer
quickly
adapted
to
the
cybersecurity
domain
.
The
new
software
engineer
quickly
adapted
to
the
cybersecurity
domain
.
•
Though
I
studied
biology
,
economics
is
outside
my
domain
of
expertise
.
Though
I
studied
biology
,
economics
is
outside
my
domain
of
expertise
.
Borrowed
into
Middle
English
from
Old
French
domaine
“
lord
’
s
estate
,”
ultimately
from
Latin
dominium
“
ownership
,
property
.”
noun
land
or
property
that
someone
owns
or
controls
•
The
vast
forest
became
part
of
the
king
’
s
domain
after
the
treaty
.
The
vast
forest
became
part
of
the
king
’
s
domain
after
the
treaty
.
•
The
estate
agent
showed
us
every
corner
of
the
noble
family
’
s
domain
.
The
estate
agent
showed
us
every
corner
of
the
noble
family
’
s
domain
.
noun
a
unique
address
on
the
internet
that
identifies
a
website
or
email
destination
•
We
bought
a
short
domain
to
make
the
website
easier
to
remember
.
We
bought
a
short
domain
to
make
the
website
easier
to
remember
.
•
The
company
’
s
email
addresses
all
share
the
same
domain
.
The
company
’
s
email
addresses
all
share
the
same
domain
.
noun
in
mathematics
,
the
complete
set
of
possible
input
values
for
which
a
function
is
defined
•
For
the
function
f
(
x
)
=√x
,
the
domain
includes
all
non-negative
real
numbers
.
For
the
function
f
(
x
)
=√x
,
the
domain
includes
all
non-negative
real
numbers
.
•
You
must
state
the
domain
before
graphing
the
equation
.
You
must
state
the
domain
before
graphing
the
equation
.