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Meanings and definitions for 401

Year 401 (CDI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.
401 (number), the natural number following 400 and preceding 402
A year: 401 BC or AD 401
Ontario Highway 401, a highway that extends across Southern Ontario, Canada There are also other roads named 401, see the List of highways numbered 401
401(a), a type of U.S. tax-deferred retirement savings plan defined by a subsection of the Internal Revenue Code
401(k), a type of U.S. employer-sponsored retirement plan defined by a subsection of the Internal Revenue Code
Bristol 401, a car produced by Bristol Cars in the early 1950s
HTTP 401, a status in the HTTP protocol indicating authentication has failed
.401 Winchester Self-Loading centerfire rifle cartridge introduced in 1910
Area code 401
Cessna 401, an airplane