(From Latin: "to, toward, a direction toward, an addition to, near, at"; and changes to: "ac-, af-, ag-, al-, an-, ap-, aq-, ar-, as-, at-" and ad- is also combined with certain words that begin with the letters c, f, g, l, n, p, q, r, s, and t.)

(Latin: to set in motion, to hurry, to shake; to drive; to do, to act; to lead, to conduct, to guide)