Once you have mastered these prefixes, it's much easier to figure out the meaning of new words when you come across them. Several prefixes serve to make the new word mean the opposite, or nearly the opposite, of the original meaning of the base word. Examples: hyperactive, hyperspace, hypertension, Examples: interactive, intersect, interstate, Examples: microcosm, microphone, microscope, Examples: misappropriate, misunderstand, misuse, Examples: overcook, overdone, overwrought, Examples: reconsider, re-evaluate, rewrite, Examples: semiconductor, semester, semi-retired, Examples: transport, transgender, translate. 50 Latin Word Roots shows how prefixes combine with many roots. See 50 Word Roots from Latin for prefixes combined with the Latin verb mittere, and then with other useful roots. Home » Govt. There are many other prefix examples on the pages mentioned below the prefix list. After you read the definition and the examples for each prefix, try to think of another word or two made from it. Some examples using words made with co-, com-, & con- to show how prefixes combine with roots to form words: (See bottom of page for more information.*). Often-- but not always-- they are used with a root from the same language. Sign up for our free newsletter, English Detective. Thus, you can take the verb activate, which means to put something to use, and change it to deactivate, which means to take something out of use. Learn useful list of common prefixes in English with definition and examples. 1. Sometimes there's also an Anglo-Saxon prefix. The explanations & examples in this negative prefix list can help you use them without confusion. It also provides lots of examples. Explain what you want in the search box below. (Click here to go straight to the prefix list and save the explanations for later and here for links to more prefix examples and practice.). Remember that some prefixes can share a meaning, such as -il, -in, -im and -ir, and that you do not generally hyphenate a prefix unless it’s attached to a proper noun. Practice a few prefixes every day-- with a new root every week or two. At best the spelling of an English vocabulary is a difficult task. a- or an-, ad- (which often Prefixes help to add complexity to the English language and make it possible to create new words that are easily understood by speakers everywhere. exo, inter, intra, peri, sub, trans, etc.). I tried to limit this list of prefixes to the most useful of all, so it would be short enough to learn easily. Understanding a few prefix examples will help you to apply logic to new words and decode them appropriately. There are many more commonly-used prefixes. There are often several prefixes with the same meaning. More examples of words with co-, com-, or con- on those pages:  colleagues, commit, commotion, compelling, complicated, compulsive, concise, conduct, confined, confirmed, conflict, confusing, conjunction, conservation, consistent, constitutional, contain, contentious, contract, contribution, convene, convert, cooperation, coordination, corruption. You might also like English Word Origins, List of Suffixes, or Important Latin Roots.