The Stacks project

Definition 31.23.3. Let $X$ be a locally ringed space. Let $\mathcal{F}$ be a sheaf of $\mathcal{O}_ X$-modules.

1. We denote $\mathcal{K}_ X(\mathcal{F})$ the sheaf of $\mathcal{K}_ X$-modules which is the sheafification of the presheaf $U \mapsto \mathcal{S}(U)^{-1}\mathcal{F}(U)$. Equivalently $\mathcal{K}_ X(\mathcal{F}) = \mathcal{F} \otimes _{\mathcal{O}_ X} \mathcal{K}_ X$ (see above).

2. A meromorphic section of $\mathcal{F}$ is a global section of $\mathcal{K}_ X(\mathcal{F})$.