1. book; volume; script
この本が必要だったんだろ？You needed this book, didn't you?
2. this; present; current; ... in question; ... at issue
3. main; head; principal
4. real; genuine; regular; proper
5. counter for long, thin objects (sticks, tubes, strings, bottles, pillars, rivers, rail lines, etc.)
6. counter for films, TV shows, etc.
7. counter for telephone calls, letters, and emails
8. counter for goals, home runs, etc.
9. counter for rounds or points (in judo, kendo, etc.)