An act of righting a wrong; compensation.
To make better; improve.
To make a formal alteration (in legislation, a report, etc.) by adding, deleting, or rephrasing.
To become better.
A verb form indicating that an action or state has been completed at the present time, in the past, or shall be completed in the future.
Often, specifically, the present perfect tense as distinguished from the past perfect and future perfect tenses.