Glossary

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Key Acceptance Delay(also: Acceptance Delay, Key Debounce)

A keyboard accessibility setting that requires a key to be held down for a specified minimum duration before it is registered as a deliberate press. Keys released before the delay period expires are ignored, filtering out brief accidental touches. Key acceptance delay is the…

Key Frame Extraction(also: Keyframe Selection, Key Frame Selection)

A computer vision technique that automatically identifies and selects the most representative or highest-quality frames from a continuous video stream. In accessibility contexts, key frame extraction is used in mobile assistive applications to select well-focused,…

Keyboard Configuration(also: Keyboard Customisation, Keyboard Settings)

The process of adjusting keyboard behaviour and settings to match an individual user's needs and abilities. For people with motor disabilities, keyboard configuration may include enabling accessibility features such as Sticky Keys, Repeat Keys, Bounce Keys, or Slow Keys, as well…

Keyboard Shortcut(also: Hotkey, Keyboard Accelerator, Access Key)

A key or combination of keys that triggers a specific command or function in software without requiring navigation through menus or interface elements. Keyboard shortcuts are essential for accessibility, enabling users who cannot use a mouse—including screen reader users, people…

Keyguard(also: Keyboard Guard, Key Guard)

A rigid cover that fits over a keyboard with holes aligned to each key, allowing users with motor impairments to rest their hands on the surface without accidentally pressing keys. Keyguards help people who have imprecise motor control, tremors, or involuntary movements to type…

Keystroke Saving(also: KS, Keystroke Reduction)

A metric used to evaluate word prediction and word completion systems, measuring the percentage of keystrokes that a user can avoid by accepting system predictions instead of typing each character individually. Keystroke saving is calculated by comparing the number of keystrokes…

Keystroke Saving Rate(also: KSR, Keystroke Savings)

A metric measuring the efficiency of text prediction systems by calculating the percentage of keystrokes saved compared to typing the same text on a standard keyboard without prediction. A KSR of 50% means the user needed only half the keystrokes they would have required…

Keystroke Savings(also: KS, Key Savings)

A metric used to evaluate word prediction systems, measuring the percentage of keystrokes eliminated by accepting predictions compared to typing the full text character by character. While keystroke savings is commonly reported in AAC research, it does not directly translate to…

Kinesthetic Feedback(also: Kinesthetic Haptics, Force Feedback)

A form of haptic feedback that engages the body’s sense of limb position, movement, and applied force — the kinesthetic sense mediated by receptors in muscles, tendons, and joints — rather than cutaneous sensation alone. Kinesthetic displays include force-feedback joysticks,…

Knee-Ankle-Foot Orthosis(also: KAFO)

A lower-limb orthosis that spans the knee, ankle, and foot to provide weight-bearing support and prevent knee buckling or hyperextension in people with significant leg weakness or paralysis - commonly due to stroke, spinal cord injury, post-polio syndrome, or muscular dystrophy.…

Knowledge Base(also: KB, FAQ Database)

A knowledge base is a structured repository of information — typically questions, answers, articles, or how-to guides — that can be searched and browsed to find solutions to problems. In accessibility contexts, knowledge bases serve as important support tools for people with…

Kurzweil Reading Machine(also: KRM, Kurzweil Reader)

A pioneering reading device for blind people invented by Ray Kurzweil in 1976, combining optical character recognition (OCR) with text-to-speech synthesis to read printed text aloud. The original device was as large as a stove and produced mechanical-sounding speech, but it…

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