
Pre fix | Meaning | Examples | | un- | not or opposite | undo, unhappy, unimportant |
| re- | again or back | redo, remix, return |
| in- | not or in | invisible |
| im- | not or in | imperfect |
| ig- | not | ignorant |
| il- | not or in | illiterate |
| ir- | not | irresponsible |
| dis- | apart | disagree |
| di- | away | diverge |
| dif- | opposite | different |
| en- | to cause to be in a place or state | enact, encourage, encircle |
| em- | to cause to be in a place or state | employ, empower |
| non- | not or opposite | nonthreatening, nonfiction, nonstop |
| in- | in | inside, insight, invest |
| im- | in | impress |
| il- | in | illumine |
| over- | over, too much | overdo, overstate, overload, oversee |
| mis- | wrong, incorrect | misunderstand, misplace |
| sub- | below, beneath, under, secondary | subconscious, substandard |
| pre- | before | predawn, preset, preview |
| inter- | between, among | intermix, intermingle, intertwine |
| fore- | before | foretaste, foreclose, forehand |
| de- | away from, out of | defrost, deforest, deflate |
| trans- | across | transmit, transfusion, transport |
| super- | over, big, extreme | superhighway, superhuman |
| semi- | half, part | semicircle, semiconductor |
| anti- | against | antidepressant, antifreeze |
| mid- | middle | midday, midsummer, midnight |
| under- | below, not enough | underfed, underweight |
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