Meaning

• To make (something) better; to increase the value or productivity (of something).

  "Buying more servers would improve performance."

• To become better.

  "I have improved since taking the tablets."

• To disprove or make void; to refute.

• To disapprove of; to find fault with; to reprove; to censure.

  "to improve negligence"

• To use or employ to good purpose; to turn to profitable account.

  "to improve one's time;  to improve his means"