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Term Definition
Idioglossia A unique speech code invented by an individual or small group of individuals that differs from the normal native language of the speaker. The speaker knows what he or she is saying, but the code is not understood by most listeners. Also the type of jargon used by twins to speak to each other while excluding others (twin speak).

Link 1: Wikipedia – Idioglossia
Induction Loop System An amplification device that uses a microphone, amplifier, and hardwire to create a magnetic field throughout the room in order to transmit sound to a person’s hearing aid.

Also called Audio Loop System.

See also Amplification Devices, Hearing Loss.
Industrial Deafness See Deafness
Infrared Sound System/td>

An amplification system through which infrared transmitters are mounted into the wall of an auditorium or theater. Sound is converted to an infrared signal that is picked up by the infrared receivers connected to hearing aids or via headphones worn by the listeners.

See also Amplification Devices, Hearing Loss.
Initial Consonant Deletion See Phonological Processes – Syllable Structure
Intonation The pattern and variation of pitch and stress in the flow of speech. It is often used by the speaker to express an attitude or emotion and to signal the difference between a question and a statement.

Link 1: Wikipedia – Intonation (Lingusitics)
Intelligibility The clarity of utterances or the degree in which speech can be understood by the listener. Intelligibility can be influenced by the rate, prosody, articulation, vocal quality and intensity of speech.
International Phonetic Alphabet (IPA) The standardized representation of sounds developed by the International Phonetic Association. This IPA is phonetic (pronunciation of speech) in design, not phonemic (the meaning or change of meaning).

  • There are 160 symbols on the chart. Each symbol represents a distinctive sound of all the world’s languages.
  • The English language uses 44 of the 160 symbols.
  • There are 12 vowels, 24 consonants and 8 diphthongs
Link 1: Wikipedia – International Phonetic Alphabet
Interrogative See question
Isolated Aphasia See Transcortical Aphasia

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