Modern Language Association (of America) Collins English Dictionary - Complete & Unabridged 2012 Digital Edition Â© William Collins Sons & Co. Ltd. 1979, 1986 Â© HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source
(b) Limitations of the Indicators: The dependency ratio is an approximation to the ratio of net consumers to net producers. As a proxy for that ratio, the dependency ratio suggests that children under age 15 as well as persons aged 65 or over are economically dependent. In many populations, however, people do not stop being economically active at age 65, nor is it true that all persons aged 15-64 are economically active.
A functional dependency is a constraint between columns of your table. For example in the table person: Here, the value in the column SSN (Social Security Number) determines the values in columns name, date of birth, address and phone number. functional dependency isn't in any normal form. Normal Form is a property of a relation that satisfies some given set of FDs. Don't rely on Wikipedia or Google. There is too much misinformation and rubbish from online sources.