Ab uno disce omnes—From a single instance you may infer the whole.
Ab urbe condita (A.U.C.)—From the building of the city, i.e., of Rome.
A bureaucracy always tends to become a pedantocracy. J. S. Mill.
A burnt child dreads the fire. Pr. 30
Abusus non tollit usum—Abuse is no argument against use. Pr.
Academical years ought by rights to give occupation to the whole mind. It is this time which, well or ill employed, affects a man's whole after-life. Goethe.
A cader va chi troppo in alto sale—He who climbs too high is near a fall. It. Pr.
A capite ad calcem—From head to heel.
A careless master makes a negligent servant. 35 Pr.
A carper will cavil at anything. Pr.