Emily Dickinson Lexicon

CON'TENT, n. [often in the plural, Contents.]

1. That which is contained; the thing or things held, included or comprehended within a limit or line; as, the contents of a cask or bale; of a room or a ship; the contents of a book or writing.
2. In geometry, the area or quantity of matter or space included in certain lines.
3. The power of containing; capacity; extent within limits; as, a ship of great content. – Bacon. [But in this sense the plural is generally used.]
4. Heads of what a book contains; an index.