Well I'm not sure if this is an algebra question but content is defined at dictionary.com as: 1. Usually, contents. A. Something that is contained: The contents of a box. b. The subjects or topics covered in a book or document. C. The chapters or other formal divisions of a book or document: A table of contents.
2. Something that is to be expressed through some medium, as speech, writing, or any of various arts: A poetic form adequate to a poetic content. 3. Significance or profundity; meaning: A clever play that lacks content. 4. Substantive information or creative material viewed in contrast to its actual or potential manner of presentation: Publishers, record companies, and other content providers; a flashy Web site, but without much content. 5. That which may be perceived in something: The latent versus the manifest content of a dream. 6. Philosophy, Logic. The sum of the attributes or notions comprised in a given conception; the substance or matter of cognition. 7. Power of containing; holding capacity: The bowl's content is three quarts. 8. Volume, area, or extent; size. 9. The amount contained. 10. Linguistics. The system of meanings or semantic values specific to a language (opposed to expression ). 11. A. Mathematics. The greatest common divisor of all the coefficients of a given polynomial. Compare primitive polynomial. b. Any abstraction of the concept of length, area, or volume.