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noncommon

Noncommon is an adjective meaning not common; unusual, rare, or distinctive. In contemporary English, uncommon is the standard term, and noncommon is typically found in older, literary, or technical contexts where a particular cadence or emphasis is desired. It may appear in literary prose, legal texts, or historical writing, where it can convey a somewhat archaic or formal tone.

Etymology: The form is built from the negating prefix non- with the adjective common, itself rooted in

Usage in mathematics and logic: In set theory and related fields, noncommon elements are those that do

Branding and other uses: Noncommon may appear as a proper noun in branding, slogans, or project names,

See also: uncommon, common, symmetric difference.

Latin
communis.
The
combination
yields
a
straightforward
negation
of
commonality,
though
modern
usage
tends
to
favor
uncommon
for
everyday
expression.
not
occur
in
all
of
the
considered
sets.
For
two
sets
A
and
B,
the
noncommon
elements
consist
of
A
\
B
and
B
\
A;
together
they
form
the
symmetric
difference
A
Δ
B.
For
example,
the
noncommon
elements
of
{1,2,3}
and
{2,3,4}
are
{1}
and
{4},
whose
union
is
{1,4}.
but
it
does
not
designate
a
single
widely
known
entity.
In
such
uses,
capitalization
signals
a
name
rather
than
a
general
adjective.