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The Collaborative International Dictionary of English v.0.48 (gcide)

Hegira \He*gi"ra\ (?; 277), n. [Written also {hejira}.] [Ar.
hijrah flight.]
The flight of Mohammed from Mecca, September 13, a. d. 622
(subsequently established as the first year of the Moslem
era); hence, any flight or exodus regarded as like that of
Mohammed.
[1913 Webster]

Note: The starting point of the Era was made to begin, not
from the date of the flight, but from the first day of
the Arabic year, which corresponds to July 16, a. d.
622.
[1913 Webster]