Last Updated：2025/11/22
(US) A nine-digit number issued to citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2). The number is issued to an individual by the Social Security Administration. Its primary purpose is to track individuals for taxation purposes. Abbreviated as SSN. In recent years the SSN has become a de facto national identification number.
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social security number
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Source Word
social security number
Noun
US
(US)
A
nine-digit
number
issued
to
citizens,
permanent
residents,
and
temporary
(working)
residents
under
section
205(c)(2)
of
the
Social
Security
Act,
codified
as
42
U.S.C.
§
405(c)(2).
The
number
is
issued
to
an
individual
by
the
Social
Security
Administration.
Its
primary
purpose
is
to
track
individuals
for
taxation
purposes.
Abbreviated
as
SSN.
In
recent
years
the
SSN
has
become
a
de
facto
national
identification
number.
Japanese Meaning
社会保障番号：アメリカ合衆国において、税務管理や個人識別の目的で市民、永住者、一部の一時労働者に割り当てられる9桁の番号。 / ※米国ではSocial Security Administrationにより発行され、SSN（エスエスエヌ）と略される。
Sense（1）
(US)
A
nine-digit
number
issued
to
citizens,
permanent
residents,
and
temporary
(working)
residents
under
section
205(c)(2)
of
the
Social
Security
Act,
codified
as
42
U.S.C.
§
405(c)(2).
The
number
is
issued
to
an
individual
by
the
Social
Security
Administration.
Its
primary
purpose
is
to
track
individuals
for
taxation
purposes.
Abbreviated
as
SSN.
In
recent
years
the
SSN
has
become
a
de
facto
national
identification
number.
Sense（2）
（ plural ）
