# fat tail

Definition from Wiktionary, the free dictionary

## English[edit]

### Noun[edit]

- The relatively high probability of a relatively extreme outcome.
- (statistics, probability) A tail of a probability distribution with significantly higher kurtosis than a normal distribution (which has kurtosis = 0).
- (statistics, probability) A tail of a probability distribution with infinite variance.

#### Synonyms[edit]

- (high probability of extreme outcome): heavy tail
- (tail of distribution with positive kurtosis): leptokurtosis