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What does SI stand for?

SI stands for Self-Insertion (fan fiction)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Slang/chat, popular culture

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Other Resources:
We have 92 other meanings of SI in our Acronym Attic

Samples in periodicals archive:

As to the vaginal self-insertion of the misoprostol rather than the oral administration, the FDA says that "[w]hile some of the modified regimens have been well described in the literature, the safety and effectiveness of the Mifeprex dosing regimens, other than the one approved by the FDA, including use of oral misoprostol tablets intravaginally, has not been established by the FDA.