What is the full form of "MA"?

Multiple access is a technique that lets multiple mobile users share the allotted spectrum in the most effective manner.
Since the spectrum is limited, the sharing is necessary to improve the overall capacity over a geographical area. This is carried out by permitting the available bandwidth to be used simultaneously by different users. In computer networks and telecommunications, the multiple access method permits various terminals to connect to the same multi-point transmission medium to transmit over it and share its capacity.