Idiolectal Feature
Definition
A linguistic habit characteristic of one specific person rather than a group. In the Unabomber case, phrase patterns such as 'feelings of inferiority' were idiolectal: they appeared consistently in both the Manifesto and in Kaczynski's private writings, and were not typical of the general population.
- Definition scope
- Habit specific to one individual, not a group
- Example case
- Unabomber Manifesto attribution
- Example phrase
- "feelings of inferiority" recurring across documents
- Analytic use
- Stylometric authorship attribution
- Key contrast
- Sociolectal features are shared by a group, not one person
Common questions
How does an idiolectal feature differ from a common phrase or cliche?+
A cliche is shared broadly across a language community, so its presence in two documents proves little. An idiolectal feature recurs unusually often in one person's own writing relative to the general population, which is what gives it evidential weight when it also appears in a disputed document.
Why did phrases like 'feelings of inferiority' matter in the Unabomber investigation?+
Investigators and later linguists found that this and other phrasings appeared repeatedly in both the Manifesto and Kaczynski's known private letters, but were not common usage otherwise. That consistency across independent writings supported common authorship alongside other evidence.
Related terms
- Authorial Profiling
- The production of demographic and psychological inferences from a text's language, as opposed to attribution, which names a specific author. The UNABOM...
- Confirmatory Evidence
- Evidence that increases the probability of a hypothesis already suggested by other means. In UNABOM, the linguistic analysis served this role: it...
- FBI Linguistic Analysis Unit (LAU)
- The FBI division responsible for linguistic profiling, author identification, and threat assessment. The LAU produced the authorial profile used in the UNABOM...
- UNABOM
- The FBI case designation for the Unabomber investigation (Universities and Airlines BOMbing). The case ran from 1978 to 1996 and is one...