The act of correcting, or making that right which was wrong; change for the better; amendment; rectification, as of an erroneous statement.

That which is substituted in the place of what is wrong; an emendation; as, the corrections on a proof sheet should be set in the margin.

an admission that you were wrong, and is generally accompanied by an apology to the reader

an information return submitted by the employer/transmitter to correct an information return that was previously submitted to and successfully processed by IRS, but contained erroneous information

a restatement of the facts without explicit admission or apology