als

1. (pathology, uncountable) Initialism of amyotrophic lateral sclerosis.Examples: "ALS is a progressive, neurodegenerative disease affecting the nerve cells in the brain and spinal cord that make the muscles of both the upper and lower body work, according to the ALS Association, a non-profit organization which works to research the disease and offer resources to people living with it."abbreviationalt-ofinitialismuncountable

2. (aviation, countable) Initialism of approach lighting system.abbreviationalt-ofcountableinitialism

3. (electronics, countable) Initialism of ambient light sensor.Examples: "Another RVR element, the ambient light sensor (ALS), is used to interpret the impact that background lighting, such as nearby runway lights, might have on the overall visibility measurement. Normally two ALSs are installed in central locations relative to the airfield environment."abbreviationalt-ofcountableinitialism