I will visit you on Wednesday. is on as used in the sentence above a preposition of time

Yes, in the sentence "I will visit you on Wednesday," the word "on" is a preposition of time. It indicates the specific day (Wednesday) when the action (visiting) will take place. Prepositions of time are used to express relationships between time and other elements in a sentence. In this case, "on" is used to refer to a specific day.