Ab initio (disambiguation)

Template:Sister project Ab initio is a Latin term used in English, meaning from the beginning.

Ab initio may also refer to:

• Ab Initio (company), an ETL Tool Software Company in the field of Data Warehousing.
• Ab initio quantum chemistry methods
• Marriages annulled under the Catholic Church are considered as annulled ab initio, meaning that the marriage was invalid from the beginning