ati-

prefix prefix to nouns, adjectives, adverbs; preverb to verbs; before vowels (except ī-) generally, but not always, taking the form acc-;

1. as prefix to nouns expresses: abundance, excess, superiority, transgression; the being beyond (the reach of).
2. as prefix to adjectives, adverbs expresses: very much, too much.
3. as preverb to verbs and their derivatives expresses: beyond, over; through; too much, very much, too far.
4. ati is sometimes inserted in iterative compounds expressing: and, adding further, even more, etc.