Prefix

A prefix is a part of a word or a word, within a word. It is put at the start of another word to make a different meaning. It can also mean a number that is put in at the start to show which number something is in a group. It is a type of affix.
compound nouns (in other cases also compound adjectives).

The following examples illustrate real prefixes.

Often people want to use a prefix to mean not. There are many prefixes that mean not.
 Unnatural means not natural.
 Apolitical means not political.
 Nonviolent means not violent.
 Indirect means not direct

We also learnt the prefixes anti which means against and auto is used to mean self or own

Some examples of these prefixes:

antisocial which means non social

anti glare which means it will prevent sun and light glare on a screen

autograph which means a person's signature

autopilot which means working by itself

Other examples of prefixes:

 bicentennial (and other number related prefixes: mono, ter/tri, tetra, quadro, penta, hepta, octo, nano etc.)
 contradiction
 encompass
 paratrooper
 percent
 periscope
 prototype
 polytechnical
 react
 semicolon

Scientists and doctors use prefixes in many words.
 Hepato- is a prefix that means liver. So hepatocellular means 'about liver cells'.
 Hydro- is a prefix that means water. So Hydroelectric dams are dams that make electricity from the flow of water.
 Pre- or Ante- are prefixes that mean before. Prenatal diagnostics is the diagnostics done before the birth of a baby.
 Post- is a prefix that means after. Post-traumatic experience would be an experience that was made after trauma.

Sometimes people make up words by adding a prefix. These words are not in a dictionary. But if people use these words enough, sometimes they go into dictionaries.
For example, we can make the word unsimple, which splits up into not simple. This is not a word in a dictionary.

Compare to suffix. Suffixes are letters put at the end of a word to change its meaning.

Category:Words
Category:Linguistics terminology