Definitions of official statement on the Web:

• A document prepared for a new municipal issue by or for the issuer. It describes the issue, financial details about the issuer and other relevant ...
  www.alahlibrokerage.com/ncbank/invest_glosry_OOm.htm

• A required document published during any municipal bond offering, the Official Statement offers financial information, details of the bond ...
  https://www.scottstringfellow.com/ss/glossary.asp

• A document which discloses material information about a new municipal issue. It is the municipal equivalent to a prospectus.
  www.edwardjones.com/en_US/resources/knowledge_center/investment_terms/index.html

• A document (prospectus) circulated for an issuer prior to a bond sale with salient facts regarding the proposed financing. ...
  www.mello-roos.com/glossary.htm

• A statement published by an issuer of a new municipal security describing itself and the issue
  home.the-wire.com/wishnet/learn/amateurglossary/wamateurglosso.html