What is the meaning of Ad-?

Doing, enacting, forming a verb.

Near, close to, adjacent.

Towards in direction or movement. Towards the midline of the body.

Intensifying, additionally.

Along, alongside.

Appending and/or prepending. Adding from either side.

Modifying.

Atop or above in position.

ad-

to (indicating that to which there is movement, tendency or position, with or without arrival)

to

usually prefixed to verbs, in which cases it often has the effect of intensifying the verbal action

your (singular)

to, towards

in many compounds, it has a purely intensive sense

augment infix used instead of ro- on verbs whose first prefix is com- and the stressed syllable starts with a consonant

Alternative form of adh-

ad- (near; at)

again, back, re-

affirmative prefix, emphasises prefixed word

Source: wiktionary.org