As a Noun: 1. A change for the better. English = improvement. 2. The act or process of becoming more advanced, skilful, or higher in rank over a period of time. English = progress. 3. The process of growing or changing over a period of time into a better or more complete form. English = development. As a Verb or Adjective: 1. To get better. English = improve 2. To become more advanced, skilful, or higher in rank over a period of time. English = progress. 3. To grow or change over a period of time into a better or more complete form. English = develop.