All arguments are equivocative through a middle term as context derives its meaning through another context which acts as a connection. This connection occurs through a regression of terms which reflects equivocation occuring through an infinite regress. Using the example of a "unicorn", again, the "unicorn" connects or disconnects to the context of "existence" through a medial term of "dream entity" or "empirical entity". These medial contexts reflect through a regression of some form where:
Unicorn --> Horse with Horn --> Dream Entity --> Existence
Unicorn --> Horse with Horn --> Empirical Entity --> Non Existence
This regression of terms, in which one context through its inversion into another context equivocates to a new context through a tautology, observes defintion as grounded in a series of strings where one phenomenon, as having multiple definitions, does so through a series of strings. This string nature to definition further necessitates equivocation as existing through a regress where the the fallacy of equivocation not only exists through the fallacy of slippery slope, but both fallacies negate eachother into prerequisite truth values that determine the definition of any given phenomenon.
Equivocation occurs through regress and regress occurs through the tautological progression where one context acts as a mediator to another.