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Definition of ab initio adverb from the Oxford Advanced Learner's Dictionary

ab initio

adverb
 
/ˌæb ɪˈnɪʃiəʊ/
 
/ˌæb ɪˈnɪʃiəʊ/
(from Latin, law or formal)
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  1. from the beginning
    • The agreement was declared void ab initio.
See ab initio in the Oxford Advanced American Dictionary

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