| Prefix | Meaning | Example | |
Prefixes that means “no” or “not” |
in-, il-, im-, ir- | not | Insecure, illegal, immoral, irresponsible |
| non- | not | nonviolent, non-poisonous | |
| un- | not | unhappy, unkind | |
| dis- | not, opposite of, undo | displease, disservice, disconnect | |
| mis- | wrong, bad | mistreat, mistake | |
| anti- | against | antivirus, antithesis, anti-war | |
| contra- | against | contradict, contrary | |
Prefixes that relate to time |
ex- | former | ex-boss, ex-spouse |
| post- | after | posttest, posterior | |
| pre- | before | predict, precede | |
| re- | again | repeat, recycle | |
Prefixes that show placement |
ab- | away, away from | absent, abnormal |
| co-, col-, com- | together with | cooperate, colleague, community | |
| de- | down form, away | descend, depart | |
| dis- | away | displace, disappear | |
| ex- | out | exit, export, ecterior | |
| in- | in | inside, interior, inhale | |
| pro- | forward, ahead | progress, promote | |
| re- | back | return, revert, report | |
| tele- | far, distant | television, telepathy | |
| trans- | across | transport, transfer | |
Prefixes that indicate how many or how much |
extra- | beyond, outside | extraordinary, extracurricular, |
| micro- | small | microscope, micro-organisms | |
| semi- | half | semiconscious, semi-formal | |
| super- | over, above | supervisor, superlative | |
Prefixes that show number of quantity |
uni-, | one | united, uniform, |
| dec-, deci- | ten | decimal, decade, decimate | |
| cent- | hundred | century, cent | |
| mill-, kilo- | thousand | millennium, kilowatts |
