In time and Preexistent

In time adverb - Within an indefinite time or at an unspecified future time.

Preexistent and in time are semantically related in sooner than expected topic. In some cases you can use "Preexistent" instead an adverb phrase "In time".

Preexistent adjective - Existing previously or before something.

In time and preexistent are semantically related in sooner than expected topic. Sometimes you can use "In time" instead the word "Preexistent" as an adjective or an adverb.