ante meridiem (L.). Before noon.
a posteriori (L.). Reasoning from effect to cause.
a priori (L.). Reasoning from cause to effect.
apropos (Fr.). Suited to the occasion.
argumentum ad hominem (L.). An argument to the individual man, i.e., to his interests and prejudices.
ars est celare artem (L.). It is true art to conceal art.
ars longa, vita brevis (L.). Art is long, life is short.
artium magister (L.). Master of Arts.
au contraire (Fr.). On the contrary.
au courant (Fr.). Fully acquainted with matters.