CONTENT(S)

The Longman Dictionary of Contemporary English throws these acceptions, among others, for the noun CONTENT. Could somebody explain to me the difference in meaning between Ab and B and why one is un plural and the other in singular?

A) contents [plural]

a) the things that are inside a box, bag, room etc

contents of

The customs official rummaged through the contents of his briefcase.



Most of the gallery's contents were damaged in the fire.


contents insurance (=insurance for things such as furniture that you have in your house)


b) the things that are written in a letter, book etc

contents of

She kept the contents of the letter a secret.



The program automatically creates a table of contents (=a list at the beginning of a document that shows the different parts into which it is divided).


He cast his eye down the contents page.




B) [singular, uncountable] the ideas, facts, or opinions that are contained in a speech, piece of writing, film, programme etc:

The content of the media course includes scripting, editing and camera work.





C) [singular, uncountable] the information contained in a website, considered separately from the software that makes the website work:

The graphics are brilliant. It's just a shame the content is so poor.