Actually, the prefix ambi- does not mean "on one side" or "one way". The prefix ambi- means "both" or "both sides". It is derived from the Latin word "amb-, ambi-" which means "both" or "around". Some examples of words with the prefix ambi- include ambidextrous (able to use both hands equally), ambivalent (having mixed feelings about something), and ambidirectional (moving or operating in both directions).
