Prefix – is a letter or a group of letters added to the beginning or the stem of the word. For example, the word “unsure” has a prefix “un” which means “not” with a root word “sure.” Hence, the word “unsure” means “not sure.”
Read this important table which contains information and examples about prefixes.
| Prefix | Meaning | Example | Meaning of the word |
| anti- | against | antibacterial | Intended to kill or reduce the harmful effects of bacteria. |
| auto- | self | autobiography | An account of a person’s life written by that person. |
| bi- | two | bicycle | A vehicle with two wheels. |
| dis- | not | disagree | to have a different opinion or be unable to agree. |
| ex- | out, former | exhale | to breathe out air. |
| il- | not | illegal | against the law. |
| im- | not | improper | being against a law or a rule; dishonest or illegal. |
| in- | not | invisible | impossible to see. |
| inter- | between | interchangeable | able to be exchanged with each other. |
| ir- | not | irrelevance | the fact that something is not related to what is being discussed or considered. |
| micro- | small | microcomputer | a small computer containing a microprocessor. |
| mis- | wrong | misdirect | to send something to the wrong place or aim something in the wrong direction. |
| mono- | one | monogamy | marriage with one person. |
| non- | not | nonpoisonous | not having the properties or effects of poison. |
| poly- | many | polytheist | one who believes in a plurality of gods. |
| post- | later, behind | postgraduate | a student who has already received one degree and is studying at a university for a more advanced degree. |
| pre- | before | prehistory | History of humankind in the period before recorded history. |
| pro- | for, forward, before | proactive | Acting in advance to deal with an expected difficulty; anticipatory. |
| re- | again | reconstruct | to construct again; rebuild. |
| semi- | half | semiconscious | Partially conscious; not completely aware of sensations. |
| sub- | under | subcontractor | someone who enters into a subcontract with the primary contractor. |
| tri- | three | triathlon | an athletic contest in which each athlete competes in three different events: swimming, cycling, and running. |
| un- | not | unbelievable | not to be believed; incredible. |
| uni- | one | unisize | in one size only, to fit most people of relatively average build. |
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sources: https://dictionary.cambridge.org, https://www.thefreedictionary.com, www.google.com
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