(1) re-, used to add the meaning "do again", especially to verbs: rebuild, remarry, reuseable, (2) re-, returning something to its original state: the regreening of our country (= making it green again by planting trees, allowing grass to grow, etc.), co-, together; with: co-owner, a co-writer/co-author, ex-, used to show that someone is no longer what they were: ex-prisoner, ex-policeman,.., micro-, very small: microorganism, microbiology, multi-, having many: multi-coloured, multi-vitamin, post-, after or later than: postgraduate, postoperative, post-lunch nap., semi-, half or partly: semi-literate, semiconscious, etc., under-, not enough or not done as well or as much as is necessary: undercooked, underprivileged, etc., (1) over-, too much or more than usual: over-excited, over-50s, (2) over-, across: Of course, the overland route is much slower than going by air., sub-, less than a number or level: sub-zero, sub-$1000, dis-, added to the front of some words to form their opposites: disagree, dishonest, in-/im-/il-/ir-, used to add the meaning "not", "lacking", or "the opposite of" to adjectives and to words formed from adjectives, un-, "not," "lacking," or "the opposite of" to adjectives, adverbs, verbs, and nouns:

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