Definition of "format"

The layout of a publication or document.  quotations  examples

(by extension) The form of presentation of something.  examples

(radio) The type of programming that a radio station broadcasts; such as a certain genre of music, news, sports, talk, etc.  examples

(computing) A file type.  examples

To create or edit the layout of a document.  examples

Change a document so it will fit onto a different type of page.  examples

(computing) To prepare a mass storage medium for initial use, erasing any existing data in the process.  examples