V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

AAL
       ATM Adaption Layer (ATM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

AAL
       Authentication Assurance Level (CC)


The Free On-line Dictionary of Computing (30 December 2018):

AAL

   ATM Adaptation Layer