*OMOP Common Data Model v5.1 Specifications*
*Authors: Christian Reich, Patrick Ryan, Rimma Belenkaya, Karthik Natarajan, Clair Blacketer*
***Release date needed***
[Back to Table of Contents](https://github.com/OHDSI/CommonDataModel/blob/master/Documentation/TableofContents.md)
[Back to Standardized Vocabularies](StandardizedVocabularies.md)
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# 3.12 ATTRIBUTE_DEFINITION