1. arch as in archive   new   backward   not   chief, main, first   Hint Half-n-half Clue   2. retro as in retrospective   backward   against   within   all, whole   Half-n-half Clue   3. syn as in synthesis   new   meet, with, together   backward   with, together   Half-n-half Clue   4. per as in perennial   chief, main, first   meet, with, together   through, complete   all, whole   Half-n-half Clue   5. intra as in intravenous   within   meet, with, together   new   back, again   Half-n-half Clue   6. con as in concomitant   against   within   meet, with, together   backward   Half-n-half Clue   7. super as in superfluous   back, again   after   above, over   with, together   Half-n-half Clue