1. That which is contained within something else, usually in this sense in the plural form, contents.
2. In psychology, the form of a dream as presented to consciousness.
3. Ambiguous usage for concentration; e.g., blood haemoglobin content could mean either its concentration or the product of its concentration and the blood volume.
Origin: L. Contentus, fr. Con-tineo, pp. -tentus, to hold together, contain