eti

This is the everyday sense of the word. It marks something as ongoing at the moment being described: a person is still alive, still speaking, still in a certain place; a state is still in force. Often it sets up a contrast with the change that is about to come, which is why it so frequently appears in phrases like "while he was still speaking" right before something interrupts.

The same word flips to the opposite meaning the instant a negative is added. With "not," "no," or "never," it means "no longer" or "no more": a thing that used to be the case has now stopped. The book of Revelation leans on this hard when it describes the new creation, piling up promises that there will be no more death, no more sea, no more night, no more curse.

So one short word covers both "it is still happening" and, once negated, "it happens no more." The reader has to watch for the negative nearby to know which way it points.

Here the word is not about time but about amount or degree. It adds something to what has already been counted or said: one more witness, one more thing you lack, one more woe still to come, an even better way beyond the one just named. English carries it with words like "further," "besides," "moreover," or "in addition."

It also intensifies. Paired with "more," it pushes a comparison up a notch (love overflowing still more and more). In a rhetorical question it presses the logic: "why do we need any further witnesses?" or "what more shall I say?" The point in each case is that there is something extra, not that time is passing.

The line between this and the first meaning can be thin, because adding a step and continuing a process are close ideas. The test is whether the word answers "is it still going on?" (the first meaning) or "is there more of it?" (this one).