
1) Judicial doctrine 2) Judicial principle 3) Legal principle 4) Pre-emption
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https://www.crosswordclues.com/clue/preemption

1) Purchase
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https://www.crosswordclues.com/clue/preemption

n. the rule of law that if the federal government through Congress has enacted legislation on a subject matter it shall be controlling over state laws and/or preclude the state from enacting laws on the same subject if Congress has specifically stated it has "occupied the field." If Congress has not clearly claimed preemption, a federal or state co...
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http://dictionary.law.com/Default.xhtml?selected=1575
[computing] In computing, preemption is the act of temporarily interrupting a task being carried out by a computer system, without requiring its cooperation, and with the intention of resuming the task at a later time. Such a change is known as a context switch. It is normally carried out by a privileged task or part of the system known as ...
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http://en.wikipedia.org/wiki/Preemption_(computing)
[land] Preemption was a term used in the nineteenth century United States to refer to a settler`s right to purchase public land at a federally set minimum price; it was a right of first refusal. Usually this was conferred to male heads of households who developed the property into a farm. If he was a citizen or was taking steps to become on...
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http://en.wikipedia.org/wiki/Preemption_(land)

• (n.) The act or right of purchasing before others. • (n.) The privilege or prerogative formerly enjoyed by the king of buying provisions for his household in preference to others. • (n.) The right of an actual settler upon public lands (particularly those of the United States) to purchase a certain portion at a fixed price in prefe...
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http://thinkexist.com/dictionary/meaning/preemption/

in U.S. history, policy by which first settlers, or `squatters,` on public lands could purchase the property they had improved. Squatters who settled ...
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http://www.britannica.com/eb/a-z/p/107

The act or right of purchasing before others. Specifically: ... The privilege or prerogative formerly enjoyed by the king of buying provisions for his household in preference to others. ... The right of an actual settler upon public lands (particularly those of the United States) to purchase a certain portion at a fixed price in preference to all o...
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http://www.encyclo.co.uk/local/20973

In United States, Federal law is the supreme law with highest authority. When there is a conflict between the Federal law and state law, the Federal law is said to preempt - win over - state law thereby displacing the effect of the state law. That`s known as premption..
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http://www.encyclo.co.uk/local/21213
Pre·ëmp'tion noun [ Prefix
pre- +
emption : confer French
préemption . See
Redeem .] The act or right of purchasing before others. Specifically:
(a) The privilege or prerogative formerly enjoyed by the king of buying provisions for his household in preference to o...
Found on
http://www.encyclo.co.uk/webster/P/148

1) The principle that a federal law supercedes a state law (and a state law supercedes a local law) where both governments have made laws on the same subject and the laws conflict. 2) The right of purchasing before others (for example, a preemptive right).
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http://www.nolo.com/dictionary/preemption-term.html

[
n] - the judicial principle asserting the supremacy of federal over state legislation on the same subject 2. [n] - the right of a government to seize or appropriate something (as property) 3. [n] - the right to purchase something in advance of others 4. [n] - a prior appropriation of something
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http://www.webdictionary.co.uk/definition.php?query=preemption
pre-emption noun a prior appropriation of something; `the preemption of bandwidth by commercial interests`
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https://www.encyclo.co.uk/local/20974

An abrupt removal of a previously scheduled infomercial (or any) broadcast. It happens most often for a breaking news story.
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https://www.encyclo.co.uk/local/22467

the act or right of claiming or purchasing before or in preference to others.
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https://www.infoplease.com/dictionary/preemption
No exact match found.