Definition 106.3.3. We say an algebraic stack \mathcal{X}' is a first order thickening of an algebraic stack \mathcal{X} if \mathcal{X} is a closed substack of \mathcal{X}' and \mathcal{X} \to \mathcal{X}' is a first order thickening in the sense of Properties of Stacks, Section 100.3.
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