Anonymity is derived from the Greek word ανωνυμία, meaning without a name or name-less, and more originally meaning without law. In colloquial use, the term typically refers to a person, and often means that the personal identity, or personally identifiable information of that person is not known.
More strictly, and in reference to an arbitrary element (e.g. a human, an object, a computer), within a well-defined set (called the "anonymity set"), "anonymity" of that element refers to the property of that element of not being identifiable within this set. If it is not identifiable, then the element is said to be "anonymous".
An example: Suppose that only Alice, Bob, and Carol have the keys to a bank safe and that, one day, the contents of the safe are missing (without the lock being violated). Without any additional information, we do not know for sure whether it was Alice, Bob or Carol that opened the safe; the perpetrator remains anonymous. In particular, each of the elements in {Alice, Bob, Carol} has a 1/3 chance of being the perpetrator. However, as long as none of them has been identified as being the perpetrator with 100% certaintly, we can say that the perpetrator remains anonymous.
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Families Anonymous - Families Anonymous' World Service Office official site includes information about FA's 12-step program; also provides on-line support group meeting directories; literature catalog; links to other support and contact information.
Families Anonymous UK - Support for families and friends concerned about drug abuse or related behavioural problems.
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