| The American Heritage® Book of English Usage. |
A Practical and Authoritative Guide to Contemporary English. 1996.
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8. Word Formation: Plurals, Possessives, Affixes, and Compounds
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| § 43. pro- |
| Pro- is another prefix that exists in two forms. The first comes from Latin pro, meaning for. In English, this pro- usually means favoring or supporting, as when it is prefixed to names of nationalities: pro-American. In this sense, the opposite of pro- would be anti: proslavery/antislavery. | 1 |
| The other pro- comes from Greek pro, meaning before, in front. The word prologue comes from Greek prologos, from pro- plus logos, meaning speech. In English, pro- often means before or earlier and is used mainly in science terms: prophase. | 2 |
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| The American Heritage® Book of English Usage. Copyright © 1996 by Houghton Mifflin Company. All rights reserved. |
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