Usually means: Extremely brief in duration, length.
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We found 10 dictionaries that define the word ultrashort:

General (10 matching dictionaries)
  1. ultrashort: Merriam-Webster.com
  2. ultrashort: Oxford Learner's Dictionaries
  3. ultrashort: American Heritage Dictionary of the English Language
  4. ultrashort: Collins English Dictionary
  5. Ultrashort, ultrashort: Wordnik
  6. ultrashort: Wiktionary
  7. ultrashort: Webster's New World College Dictionary, 4th Ed.
  8. ultrashort: Infoplease Dictionary
  9. ultrashort: Dictionary.com
  10. ultrashort: Dictionary/thesaurus

Definitions from Wiktionary (ultrashort)

adjective:  Very short.
adjective:  (sciences) Extremely short in duration, typically on the femtosecond scale
adjective:  (physics, of a wave) Having a wavelength of between 1 and 10 metres
adjective:  (finance) Having a very short term of investment, typically less than a year
noun:  (finance) A bond with an extremely short term, typically less than a year

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