from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Utility, advantage, or self-interest considered as the determinant of value or motivation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The principle that the ultimate initiator of an action is likely he who stands to gain from the action.
from the GNU version of the Collaborative International Dictionary of English
- Lit., for whose benefit; incorrectly understood, it came to be used in the sense, of what good or use; and hence, (what) purpose; object; specif., the ultimate object of life.
from The Century Dictionary and Cyclopedia
- n. For whose benefit? popularly, but incorrectly, for what use or end?
From Latin cui bonō (est), for whom (it is) of advantage : cui, dative of quī, who + bonō, dative of bonum, advantage.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin cui est bono? ("To whom is it a benefit?") (Wiktionary)