a2

 

abbreviation

  • (in travel timetables) arrives: Penzance a 0915
  • [in combination] (in units of measurement) atto- (10−18).
  • British (with reference to sporting fixtures) away: March 15 Sheffield United (a)
  • (used before a date) before: a1200
    [from Latin ante]

symbol

(a) Physics
  • acceleration.