Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 24 of 333
- American Sign Language (ASL)
- A complete, natural language with its own grammar, syntax, and vocabulary, expressed through hand shapes, facial expressions, and body movements, used primarily by Deaf communities in the United State…
- American Sign Language (ASL, Ameslan)
- A complete, natural language that uses hand movements, facial expressions, and body posture to convey meaning, serving as the primary language of many Deaf people in the United States and parts of Can…
- Americans with Disabilities Act (ADA, ADA 1990)
- The Americans with Disabilities Act (ADA) is landmark US civil rights legislation enacted in 1990 that prohibits discrimination against individuals with disabilities in all areas of public life, inclu…
- Amnesia (Memory Loss, Amnestic Disorder)
- A neurological condition characterised by the partial or complete inability to recall past experiences (retrograde amnesia) or to form new memories (anterograde amnesia). Amnesia results from damage t…
- Amyotrophic Lateral Sclerosis (ALS, Motor Neurone Disease, MND, Lou Gehrig's Disease)
- A progressive neurodegenerative disease that affects motor neurons controlling voluntary muscle movement, leading to progressive weakness, muscle wasting, and eventually loss of the ability to speak, …
- Amyotrophic Lateral Sclerosis (ALS, Lou Gehrig's Disease, Motor Neurone Disease, MND)
- A progressive neurodegenerative disease affecting motor neurons in the brain and spinal cord, leading to muscle weakness, paralysis, and eventually respiratory failure. ALS typically progresses over 2…
- Anarthria
- A severe motor speech disorder characterized by complete or near-complete loss of the ability to produce speech due to muscle weakness or paralysis affecting the articulatory organs (tongue, lips, pal…
- Anchor Text (Link Text, Hyperlink Text)
- The visible, clickable text within a hypertext link that is intended to describe the link's destination or purpose. Descriptive anchor text (e.g., "download the annual report") provides clear informat…
- Anchored Generative Model (Anchored Transformation Model)
- A constrained AI generation approach where content creators define upper and lower bounds (anchors) of acceptable variation, and a generative model interpolates between these boundaries based on user …
- Anchoring Effect (Anchoring Bias, Cognitive Anchoring)
- A cognitive bias in which people rely too heavily on an initial piece of information (the "anchor") when making subsequent decisions or judgements. In the context of digital accessibility, the anchori…
- Android Accessibility (Android A11y)
- The accessibility features, APIs, and design guidelines built into the Android operating system that enable people with disabilities to use Android devices. Android accessibility includes TalkBack (sc…
- Android Accessibility Service (AccessibilityService, Android a11y Service)
- The Android Accessibility Service is a system-level API that lets an app observe and interact with the UI of other applications on the device, exposing the hierarchical view tree (class names, text, b…
- Animal-Assisted Therapy (AAT, Pet Therapy)
- A non-pharmacological therapeutic approach in which interaction with animals — typically dogs, cats, or horses — is used to support physical, cognitive, social, or emotional health goals. Evidence sug…
- Aniridia
- A rare congenital eye condition involving the partial or complete absence of the iris, often accompanied by reduced visual acuity, light sensitivity (photophobia), nystagmus, and sometimes glaucoma or…
- Ankle Foot Orthosis (AFO, Ankle Brace, Foot Drop Brace)
- An external medical device that encompasses the ankle joint and all or part of the foot, designed to support the ankle and improve gait in people with muscle weakness, spasticity, or structural deform…
- Ankle-Foot Orthosis (AFO)
- A lower-limb orthosis that supports the ankle and foot, typically prescribed to control foot drop, improve toe clearance during swing, and stabilise the ankle during stance. AFOs come in solid, hinged…
- Annotation (Web Annotation, Content Annotation)
- The practice of adding supplementary information, notes, or metadata to existing digital content, typically without modifying the original source. In accessibility, annotation is used to add alternati…
- Annotation-based Transcoding (Annotation-driven Transcoding, External Annotation)
- Annotation-based transcoding is a web accessibility technique in which a third party (not the site owner) authors a separate metadata file — the 'annotation' — that describes how to restructure or re-…
- Anomalous Trichromacy (Anomalous Trichromatic Vision)
- A category of colour vision deficiency where all three types of cone cells are present but one type has a shifted sensitivity range, resulting in altered colour perception that is less severe than dic…
- Anomalous Trichromat (Anomalous Trichromacy, Colour Anomaly)
- A person who has all three types of cone cells in the retina but one type has a shifted spectral sensitivity, causing altered colour perception that is less severe than dichromacy. Anomalous trichroma…