From Ilah, “God.” (1) That which is diving e.g. ad-dinu ‘l-Ilahi, the divine religion. (2) Ilahi is also used for the era instituted by the Emperor Akbar, commencing with the first year of his reign, A.H. 963, A.D. 1556. Although found on the coins of Akbar and his immediate successors, it never obtained currency, and is now obsolete.
Based on Hughes, Dictionary of Islam