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in or of the month preceding the current one: on the 12th ultimo. Abbreviation: ult., ulto. Compare instant ( def 11 ), proximo.

1575–85; < Latin ultimō (mēnse or diē) in the last (month) or on the last (day)

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World English Dictionary
abbreviation for
1.  ultimate(ly)
2.  Also: ulto ultimo

ultimo (ˈʌltɪˌməʊ)
instant Compare proximo ult. in or during the previous month: a letter of the 7th ultimo
[C16: from Latin ultimō on the last]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"in the month preceding the present," 1616, common in abbreviated form ult. in 18c.-19c. correspondence and newspapers, from L. ultimo (mense) "of last (month)," abl. sing. masc. of ultimus "last" (see ultimate). Earlier it was used in the sense of "on the last day of the month specified" (1582).

see ultimo.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. ultimate

  2. ultimately

  3. Latin ultimo (last month)

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for ult
For example, the ult logo and motto must now be on all school publications.
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