An idiolect is the unique language used by an individual that can be influenced by regional dialects, social contexts, professions, and knowledge of multiple languages. A register or style is a type of language used in a specific social setting defined by levels of formality or culturally recognized contexts like baby talk or joking exchanges between friends. Settings influence registers through degrees of formality and language appropriate for social situations.

1. LANGUAGE VARIETIES
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6. Idiolect
An idiolect is defined as "the language use typical
of an individual person." An individual's idiolect
may be affected by contact with various regional
or social dialects, professional registers, and in the
case of multilingual , various languages.
Registers and Styles
A register (sometimes called a style) is a variety of
language used in a particular social setting.
Settings may be defined in terms of greater or
lesser formality, or in terms of socially recognized
events, such as baby talk, which is used in many
western cultures when talking to small children, or
a joking register used in teasing or playing the
dozens.