Word.ws English Dictionary

in infinitum

in infinitum is the alternative form of ad infinitum.

Meaning of ad infinitum

Adverb

ad infinitum (not comparable)

  1. Endlessly; for ever; never-endingly.
    • Great fleas have little fleas upon their backs to bite 'em,
      And little fleas have lesser fleas, and so ad infinitum.
      And the great fleas themselves, in turn, have greater fleas to go on;
      While these again have greater still, and greater still, and so on.1872, Augustus DeMorgan, Siphonaptera

Origin of in infinitum

Borrowed from Latin in infinitum.

Questions about in infinitum

What is in infinitum the alternative form of?
In infinitum is the alternative form of ad infinitum.

Words near in infinitum in the dictionary

  1. in house
  2. in hysterics
  3. in idea
  4. in ill part
  5. in increment
  6. in infinitum
  7. in irons
  8. in isolation
  9. in it
  10. in its entirety
  11. in its totality

Source and license

Adapted from Wiktionary: in infinitum (page history and authors); ad infinitum (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “in infinitum.” Word.ws, https://word.ws/in_infinitum. Based on Wiktionary, CC BY-SA 4.0.