1. con as in concomitant   against   far, distant   not   meet, with, together   Hint Half-n-half Clue   2. re as in recant   back, again   through, complete   within   with, together   Half-n-half Clue   3. intra as in intravenous   backward   through, complete   within   back, again   Half-n-half Clue   4. retro as in retrospective   back, again   related, beyond   through, complete   backward   Half-n-half Clue   5. arch as in archive   chief, main, first   meet, with, together   after   backward   Half-n-half Clue   6. in as in inchoate   after   within   far, distant   not   Half-n-half Clue   7. per as in perennial   chief, main, first   through, complete   back, again   far, distant   Half-n-half Clue