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.
ad- (toward), becoming ac- + Latin cedere (go, yield) → accedere (approach)
adhere — To stick firmly to something or follow a rule or belief closely.
Latin ad- (to) + haerere (stick) → adhaerere (stick to) → adhere
attenuate — To make weaker, thinner, or less intense.
ad- (to), becoming at- + Latin tenuare (make thin), from tenuis (thin) → attenuare
adjoin — To be next to and touch something.
Latin ad- (to) + jungere (join) → adjungere → French ajoindre → adjoin
affix — To attach something firmly.
ad- (to), becoming af- + Latin figere (fasten), with participle fixus → affigere
aggrandize — To increase someone's power, wealth, or importance.
French agrandir (make larger): a-, from Latin ad (to), + grandir (grow large); English ending -ize
apportion — To divide and distribute shares.
Anglo-French aporcioner: a-, from Latin ad (to), + porcion (share) → apportion
assimilate — To absorb something or become similar to a surrounding group.
ad- (to), becoming as- + Latin similis (like) → assimilare (make similar)

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