Merging

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Merging refers to two or more headmates or fragments blurring together in a temporary or permanent way, such that they are no longer meaningfully distinct for some period of time. It's more commonly used in tulpa & thoughtform communities.

Merging is also seen as ethically complex by some sections of the multiplicity community, just like fusion. Accidental and temporary merges are generally seen as ethically neutral, but so called forced merges – in which one or both parties don't consent to the merge – might be seen as a last resort or even universally wrong, or even akin to murder.

Related Terms
Merging can used as a non-medical alternative to fusion by some trying to avoid association with psychiatric terms. The main difference is that fusion is (almost always) permanent, while merging can be nonpermanent too.