(also a- before sc , sp , st ; ac- before c , k , q ; af- before f ; ag- before g ; al- before l ; an- before n ; ap- before p ; ar- before r ; as- before s ; at- before t )
■ prefix
1》 denoting motion or direction to: advance.
2》 denoting reduction or change into: adulterate.
3》 denoting addition or increase: adjunct.
Origin
from L. ad 'to'.