Prefixes and Their Meanings

Front

tri-

Back

three

Front

non-

Back

not

Front

pre-

Back

before

Front

re-

Back

again

Front

anti-

Back

against

Front

co-

Back

jointly or together

Front

dis-

Back

not

Front

mis-

Back

bad or wrong

Front

tricycle

Back

a three-wheeled cycle

Front

triathlon

Back

a race with three parts: running, swimming, and bicycling