'Ultimo' definitions:

Definition of 'ultimo'

(from WordNet)
adjective
In or of the month preceding the present one; "your letter received on the 29th ult" [syn: ultimo, ult]

Definition of 'Ultimo'

From: GCIDE
  • Ultimo \Ul"ti*mo\ [L. ultimo (mense) in the last month.] In the month immediately preceding the present; as, on the 1st ultimo; -- usually abbreviated to ult. Cf. Proximo. [1913 Webster]