Prefix definitions

prē'fĭks'
A syllable, group of syllables, or word joined to the beginning of another word or a base to alter its meaning or create a new word (Ex.: pre- in precool, un- in unsure)
noun
57
5
A title that is placed before a person's name, as Dr.
noun
49
4
An affix, such as dis- in disbelieve, attached to the front of a word to produce a derivative word or an inflected form.
noun
46
4
An identifying letter or number placed before another number, etc.
noun
45
4
To fix to the beginning of a word, etc.; esp., to add as a prefix.
verb
41
1
A title placed before a person's name.
noun
41
2
To put or attach before or in front of.
verb
35
1
To fix beforehand.
verb
35
1
To settle or arrange in advance.
verb
32
2
The definition of a prefix is a word or part of a word that is placed at the beginning of another word to change its meaning.

An example of prefix is adding extra to ordinary, creating extraordinary.

noun
6
1
To add as a prefix.
verb
0
0
To add a prefix to.
verb
0
0
That which is prefixed; especially one or more letters or syllables added to the beginning of a word to modify its meaning; as, pre- in prefix, con- in conjure.
noun
0
0
To determine beforehand; to set in advance. [from 15th c.]
verb
0
0
To put or fix before, or at the beginning of something; to place at the start. [from 16th c.]
verb
0
0
The beginning or to add to the beginning. To prefix a header onto a packet means to place the header characters in front of the packet. "To prefix" at the beginning is the opposite of "to append" characters at the end. See prepend.
0
1

Origin of prefix

Middle English prefixen from Old French prefixer pre- before (from Latin prae- pre–) fixer to place (from Latin fīxus) (past participle of fīgere to fasten dhīgw- in Indo-European roots) N., from New Latin praefīxum from neuter sing. of Latin praefīxus past participle of praefīgere to fix in front prae- pre- fīgere to fasten