Epi is the prefix to change to "dia". One has "epi"logue which changes to "dia"logue...a conversation.
Epidemic, epidermis, epigramme, eoigraph, elileptic, epilogue, episode, epistle, epithet, epitome, epistolary, epicurian
Unchange
The prefix meta- means after (beyond) and the Greek root morphos means change.
Prefixes: Converse can be added as a prefix to words such as conversation, conversion, or controversial. Suffixes: Converse can be added as a suffix to words like diverse, perverse, or traverse.
Change
No, "arti" is not a prefix. It is not commonly used at the beginning of words to change their meaning.
If you add a prefix to a word, you can change the meaning.
A prefix is a letter or group of letters added to the beginning of a word to change its meaning.
The "un-" prefix turns a word into its opposite.
Unaccept, though it is a prefix and the opposite of accept, appears not to be an accepted English word. Unaccepting, unaccesptable, are proper words, but need the added suffix to qualify. There seems to be a discussion on the internet about whether, and in what context, unaccept is acceptable. I advice not to use the word unaccept!
A prefix, such as "pre" added to "view" to create "preview".
"In" is a prefix in the word "survivors." A prefix is a group of letters added to the beginning of a word to change its meaning or create a new word.