( BrE ) ( US A.H. ) / ˌeɪ ˈeɪtʃ/ abbreviation
used in the Muslim calendar to show a particular number of years since the year when Muhammad left Mecca in AD 622 (from Latin 'Anno Hegirae') :
a Koran dated 556 AH
—compare AD , BC , BCE , CE
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WORD ORIGIN
from Latin anno Hegirae .