Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: Greek, name of the fifth and smallest letter of the Greek alphabet

iota

 noun
     
i‧o‧ta

not one/an iota

not even a small amount:
It won't make an iota of difference.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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