Step 1: Understanding the Concept:
The question asks for the definition or full form of the acronym AASU.
Step 2: Detailed Explanation:
AASU stands for the All Assam Students' Union. It is a prominent and influential student organization in the state of Assam, India. AASU is most famously known for leading the six-year-long Assam Movement (or Assam Agitation) from 1979 to 1985. The primary objective of this movement was to identify and deport illegal immigrants, mainly from Bangladesh, who the protestors felt were threatening the culture, language, and economic future of the indigenous Assamese people. The movement culminated in the signing of the Assam Accord in 1985 with the central government.
Step 3: Final Answer:
AASU is the acronym for the All Assam Students' Union, a student organization in Assam best known for leading the Assam Movement against illegal immigration.