p.a.

Adverb

• by the year; every year (usually with reference to a sum of money paid or received)
  • he earned $100,000 per annum
    
  • we issue six volumes per annum
    

Noun

• an electronic amplification system used as a communication system in public areas

Related words

• Synonyms: 
  per annum , per year , each year , annually , public address system , P.A. system , PA system , P.A. , PA