ad/ac/af/ag/ap/as/at

to or toward

Spelled ad, ac, af, ag, ap, as, at · ad 'to, toward'; its final consonant often changes to match the next sound

Latin ad moves toward something: adjoin joins one thing to another, affix fastens it to something, and assimilate makes it similar.

Words built from it

accede — To agree to a request or take up an office.
ac- (toward; form of ad-) + cede (go; yield)
adhere — To stick firmly to something or follow a rule or belief closely.
ad- (toward) + here (stick)
attenuate — To make weaker, thinner, or less intense.
at- (toward; form of ad-) + tenu (thin) + -ate (make)
adjoin — To be next to and touch something.
ad- (toward) + join (connect)
affix — To attach something firmly.
af- (toward; form of ad-) + fix (fasten)
aggrandize — To increase someone's power, wealth, or importance.
ag- (toward; form of ad-) + grand (large) + -ize (make)
apportion — To divide and distribute shares.
ap- (toward; form of ad-) + portion (share)
assimilate — To absorb something or become similar to a surrounding group.
as- (toward; form of ad-) + simil (like) + -ate (make)

adamant — It comes from Greek adamas (unconquerable), once a name for an extremely hard substance. Its ad is not Latin ad-.