Definition 89.8.9. Let $\mathcal{F}$ be a category cofibered in groupoids. Let $\xi$ be a formal object of $\mathcal{F}$ lying over $R \in \mathop{\mathrm{Ob}}\nolimits (\widehat{\mathcal{C}}_\Lambda )$. We say $\xi$ is versal if the corresponding morphism $\underline{\xi }: \underline{R}|_{\mathcal{C}_\Lambda } \to \mathcal{F}$ of Remark 89.7.12 is smooth.

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