There are multiple definitions:

1. posterior axillary line(English)

   • ECG
   • Electrophysiology

2. Paired Associates Learning(English)

   • used for assessment of mild cognitive impairment
   • AD, CSF, T-tau
   • Alzheimer's disease, Dementia, Cognitive function
   • https://doi.org…3233/JAD-160766

3. plasma ammonia level(English)

   • high PAL in ALF patients appears to correlate with clinical features of cerebral edema and raised intracranial tension
   • ALF, CLD, HE
   • Clinical chemistry, Hepatology, Brain (dys)function
   • https://doi.org…hem.2005.04.013

4. progressive addition lens(English)

   • GP, BAT, cpd
   • Ophthalmology
   • https://doi.org…232185.00091.45

5. peer assisted learning(English)

   • Education, Nurse / nursing
   • https://doi.org…RIR-2016-003295