1. To get better; SYN. improve, ameliorate, meliorate.
2. To surpass in excellence; SYN. break.
3. To make better in quality or more valuable; SYN. improve, amend, ameliorate, meliorate.

ETYM Pref. im- not + prove: cf. Latin improbare, French improuver.
1. To make better.
2. To develop by construction or renovation.

1. To declare holy or pure or free from sin; SYN. sanctify.
2. To remove impurities from; SYN. sublimate, make pure, distill.

1. To attenuate or reduce in vigor, strength, or validity by polishing or purifying
2. To make more precise or increase the discriminatory powers of
3. To reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities
4. To treat or prepare so as to put in a usable condition