What are Prefixes? A Prefix is a word or a part of word that is added at the beginning of a word to change its meaning. A List of Common Prefixes Prefix Meaning Examples anti- against antibiotic, antidepressant ante- before antedate, anteroom post- after postpone re- again reunite, return semi- half semi-final co- with co-worker, co-operation dis- opposite of disagree, disapprove extra- more than extracurricular, extraordinary fore- before forecast, foreword, foremost inter- between intermediate,interact macro- large macroeconomics micro- small microscope, microwave mis- wrong mistake, misunderstand multi- many multiple, multitask pro- forward promotion, progress uni- one universal poly- many polygon sub- under submarine pre- before predict tri- three tricycle omni- all omnipotent super- above superlative mid- middle midway trans- across transport auto- self
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