1. two-year long or every two years.   Hint First letter clue   2. spread around like a gas; verbose.   First letter clue   3. cross-bred or mongrel.   First letter clue   4. having common center.   First letter clue   5. infinitely small or very tiny.   First letter clue   6. pertaining to the stars or spiritual.   First letter clue   7. basic or essential.   First letter clue