ultimo definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Old-fashioned (in the) last (month): yours of the 13th (day) ultimo received
Origin: Classical Latin ultimo (mense), (in the) last (month), ablative singular of ultimus: see ultima
ultimo definition by American Heritage Dictionary
adverb Abbr. ult.
In or of the month before the present one: on the 15th ultimo.
Origin: Latin ultimō (mēnse), in the last (month), ablative of ultimus, last; see ultimate.