What does the prefix im- mean in the word impartial?

Like a referee in a sports event, the judge in a trial is expected to be impartial.
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The prefix "im-" in the word "impartial" means "not".

The prefix "im-" in the word "impartial" means "not." Therefore, the word "impartial" means "not partial" or "not biased." In the given sentence, it suggests that the judge in a trial is expected to be unbiased and not favor any particular side.