What is the definition of prefix?

Answer 1

The prefix is at the beginning of the word.

Prefixes and suffixes are both kinds of affixes. That is, they are word parts that attach to the beginning or end of a word or word base (a word stripped down to its simplest form) to produce a related word or an inflectional form of a word. Examples are in- in informal and both re- and -ing in reporting.

Answer 2

A prefix is a group of letters attached to the beginning of a word to change its meaning or create a new word. It comes before the root word and can alter the word's grammatical function or give it a new context.

Answer 3

A prefix is another word for something. Like a prefix to 'short' is 'small'. Another prefix is from 'hat' is 'cap'.