SAD
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The word Sad refers to an emotional condition, the antonym of "happy". Sadness is often associated with depression, suffering or grief.
SAD is a three letter acronym for multiple medical and psychological disorders:
- Schizoaffective disorder
- Seasonal Affective Disorder
- Sexual Arousal Disorder
- Social Anxiety Disorder.
Other acronyms:
- in software development, a Software Architecture Document
- in business computing and information science, Systems (or System) Analysis and Design
- an Indian political party, the Shiromani Akali Dal
- the Central Intelligence Agency's special operations force, the Special Activities Division
- a technique to analize materials by diffraction, small angle diffraction
- the humourous holiday Singles Awareness Day
- source-to-axis distance - in medical physics and radiation oncology, the distance from the radiation source of the point along the beam axis of a radiation therapy machine which designates the axis of rotation of the gantry of said machine.