Ab Initio Definition

ăb ĭ-nĭshē-ō
From the beginning.
Webster's New World
From the first act. From the beginning; back to one’s creation or inception.
Webster's New World Law
(law) From the time when a legal document comes into force. [Early 17th century.]
(sciences) Calculated from first principles, i.e. from basic laws without any further additional assumptions.
(of an academic course) Taken with no prior qualifications.

Origin of Ab Initio

  • Latin ab initiō ab from initiō ablative of initium beginning

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin ab (“from”) + initiō, ablative singular of initium (“beginning”).

    From Wiktionary

  • L

    From Webster's New World College Dictionary, 5th Edition

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ab initio