A prefix is a group of letters or syllable which is attached to the front of a root word to form another word which usually changes its meaning.
The following are examples with their meaning.
Prefix Meaning New Words/Derivative
un- not unhappy, untrue
dis- not discomfort, dislike
non- not nonsense, non-smoker
mis- wrong mismanage, mislead
mal- bad malfunction, maltreat
super- exceeding supernatural, superman
out- exceed outdo, outlive
sub- below substandard,subhuman
hyper- beyond hypertension, hyperactive
anti- against anti-social, antiviral
Form words with these prefixes: pro-, inter-, trans-, pre-, over-, under-