1pre·fix 
/ˈpri:ˌfɪks/ noun plural pre·fix·es
[
count]
1 : a letter or group of letters that is added at the beginning of a word to change its meaning
▪ Add the prefix “re-” to form the words “retell” and “recall.” —
compare affix, suffix
2 old-fashioned : a title (such as
“Mr.
” or
“Dr.
”) that is used before a person's name
