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This glossary covers a wide range of topics and includes terms that describe people, technology, concepts, and more. Some of the terms, marked by this icon , are widely considered to be

This term is generally agreed to be offensive toward or a person or group of people. We strongly recommend you do not use this term and instead use a term not usually thought to be offensive. While it is possible that some people will not be offended by this term, just as some people will be offended by other terms when no harm is intended, it is best to avoid. Remember that what is considered offensive can also change over time, by scenario, and by relationship. We provide this library of terms for informational purposes and we welcome feedback to help us get it right.


  • Talking Devices

    Talking devices are augmentative and alternative communication (AAC) devices that help people communicate. A...

  • Text-to-Speech (TTS)

    Text-to-speech is assistive technology software that reads digital text aloud. It takes digital words on a device...

  • Tab order

    An important part of keyboard accessibility, tab order describes the order in which elements come into focus when...

  • Tactile

    A term to describe touch, or concepts or objects that are based on touch.

  • Telehealth

    According to the U.S. Department of Health and Human Services, Telehealth sometimes called Telemedicine: is the...

  • Tetraplegia

    Tetraplegia is another term for quadriplegia, which is paralysis in all four limbs and possibly torso.

  • Trisomy 21

    Trisomy is the medical term for a copy of a chromosome and 21 refers to the chromosome copied that results in...

  • TTY (Teletypewriter)

    A device that enables phone communication through typed messages for people who can't or choose not to communicate...