a or aa (Gr. ana), in med., of each the same quantity.
A.B., Bachelor of Arts.
A.D. (L. anno Domini), in the year of our Lord.
ad lib., or ad libit. (L. ad libitum), at pleasure.
Æ., Æt. (L. ætatis), of age; aged.
A.M. (L. artium magister), Master of Arts.
A.M. (L. ante meridiem), before noon.
A.M. (L. anno mundi), in the year of the world.
anon., anonymous.
A.R.A., Associate of the Royal Academy.