proclamation
The word announcement is a noun that means a formal written or printed invitation, the act of announcing, a brief item or advertisement (such as in a newspaper) or a public statement.
The wording of the announcement would be the biggest difference between an informal and a formal announcement. An informal announcement doesn't have to be as proper and politically correct as a formal announcement would need to be.
a type of memo that is used to inform or present an announcement.
"He announced to everyone that he was getting married tomorrow."
'Announce' is the root of the word.
The noun 'announcement' is a concrete noun as a word for a broadcast message, such as a program note or commercial; or printed formal statement or notice, such as for a wedding or a relocation. The noun 'announcement' is an abstract noun as a word for the act of announcing; a declaration.
The word "announcement" in Tagalog is "pahayag" or "anunsiyo."
three
proclamation
Some suggestions: Declaration Announcement Account Speech Proclamation Assertion Testimony Account Report Receipt Invoice
Banns
There is not an actual abbreviation for the word announcements. In shorthand, announcement is written as anncmnt and in some email subject lines announcement is sometimes shortened to ann.
bulletin
A good online source of inspiration for the wording of a wedding announcement would be punchbowl.com which gives tips and advice on how to word the announcement to both friends and family.
His countenance changed considerably as he was hearkening to the announcement.
A notice is a warning made in advance of an event to allow preparations to be made. An announcement is a formal statement about a pending event or situation.