Partial disability describes a situation where an individual’s physical or mental impairment restricts, but does not totally prevent, their ability to work or carry out normal daily activities. It is commonly used in personal injury, employers’ liability, clinical negligence and insurance disputes to assess residual earning capacity and quantify damages or benefits.The expression “partial disability” itself is not a defined statutory term in the main UK or Irish disability discrimination or social security legislation. Instead, legislation in England and Wales, Scotland, Northern Ireland and Ireland typically refers to “disability”, “incapacity for work”, “loss of faculty” or “loss of amenity”. “Partial disability” is therefore a descriptive label used by courts, medical experts and insurers, especially in relation to permanent or temporary partial incapacity.In practice, partial disability is relevant to: (i) assessing loss of earnings and future employability; (ii) determining entitlement and level of payment under permanent health insurance, critical illness, income protection and accident policies; and (iii) evaluating rehabilitation and reasonable adjustments. Usage and underlying principles are broadly consistent across the UK and Ireland, though specific statutory tests and benefit schemes differ by jurisdiction.