To instruct or teach someone in a doctrine; to indoctrinate someone with a particular set of beliefs or principles.
From doctrine (Latin doctrina 'teaching') + -ate (from Latin -atus 'made, done'). This is a rare verb form created to describe the act of teaching doctrine.
While 'indoctrinate' (with the negative prefix in-) is common, the plain 'doctrinate' is almost never used—showing how a single prefix can flip a neutral word into one suggesting manipulation and loss of critical thinking.
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