Meaning

1. proof, piece of evidence (that which evinces the realness of something)
2. proof, piece of evidence (that which evinces the realness of something)
3. proof, piece of evidence (that which evinces the realness of something)
4. proof (document confirming something)
5. identity document, ID (document which may be used to prove a person's identity)
6. proof (series of consecutive sentences proving the validity of some statement)
7. (obsolete) attempt (try to achieve one's intention)
8. (obsolete) leadership; stimulus
9. (obsolete) school register