n. & v.
n. 1 a verbal element placed at the beginning of a word to adjust or qualify its meaning (e.g. ex-, non-, re-) or (in some languages) as an inflectional formative. 2 a title placed before a name (e.g. Mr).
v.tr. (often foll. by to) 1 add as an introduction. 2 join (a word or element) as a prefix. prefixation n. prefixion n.
[ earlier as verb: ME f. OF prefixer (as PRE-, FIX): (n.) f. L praefixum ]