What is "subordinator"

n. (context grammar English) a lexical class of words that joins a clause at a subordinate syntactic level.

adj. used of words such as relative pronouns and subordinating conjunctions that serve to subordinate sentence constituents; "`that' in `the house that we bought' is a subordinator"

In the mathematics of probability, a subordinator is a concept related to stochastic processes. A subordinator is itself a stochastic process of the evolution of time within another stochastic process, the subordinated stochastic process. In other words, a subordinator will determine the random number of "time steps" that occur within the subordinated process for a given unit of chronological time.

In order to be a subordinator a process must be a Lévy process. It also must be increasing, almost surely.