Related to or based on a doctrine, which is a set of beliefs or principles that an organization or belief system teaches.
From doctrine (Latin doctrina 'teaching') + -al (from Latin -alis 'relating to'). This is the standard adjective form dating back to medieval usage in religious and philosophical contexts.
The word 'doctrinal' appears constantly in theology, law, and politics, because every major belief system and institution needs to define what it fundamentally teaches—it's how ideas become official and binding.
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