Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. From the beginning.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adv. Calculated from first principles, i.e. from basic laws without any further additional assumptions.
  • adv. Taken with no prior qualifications.

from The Century Dictionary and Cyclopedia

  • n. From the beginning.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. at the beginning

Etymologies

Latin ab initiō : ab, from + initiō, ablative of initium, beginning.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ab ("from") + initiō, ablative singular of initium ("beginning"). (Wiktionary)

Examples

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  • JM notes there are some folk who look backwards ‘ab initio’

    August 9, 2009