| 单词 | power |
| 释义 | Word Frequency power(ˈpaʊə) noun 1. ability or capacity to do something 2. (often plural) a specific ability, capacity, or faculty 3. political, financial, social, etc, force or influence 4. control or dominion or a position of control, dominion, or authority 5. a state or other political entity with political, industrial, or military strength 6. a person who exercises control, influence, or authority a power in the state 7. a prerogative, privilege, or liberty 8. a. legal authority to act, esp in a specified capacity, for another b. the document conferring such authority 9. a. a military force b. military potential 10. mathematics a. the value of a number or quantity raised to some exponent b. another name for exponent (sense 4) 11. statistics the probability of rejecting the null hypothesis in a test when it is false. The power of a test of a given null depends on the particular alternative hypothesis against which it is tested 12. physics, engineering a measure of the rate of doing work expressed as the work done per unit time. It ismeasured in watts, horsepower, etc Symbol: P13. a. the rate at which electrical energy is fed into or taken from a device or system. It is expressed, in a direct-current circuit,as the product of current and voltage and, in an alternating-current circuit, as the product of the effective values of the current and voltage and the cosine of the phase angle between them. It is measured in watts b. (as modifier) a power amplifier 14. the ability to perform work 15. a. mechanical energy as opposed to manual labour b. (as modifier) a power mower 16. a particular form of energy nuclear power 17. a. a measure of the ability of a lens or optical system to magnify an object, equal to the reciprocal of the focal length. It is measured in dioptres b. another word for magnification 18. informal a large amount or quantity a power of good 19. (plural) the sixth of the nine orders into which the angels are traditionally divided in medieval angelology 20. in one's power 21. in someone's power 22. the powers that be verb (transitive) 23. to give or provide power to 24. to fit (a machine) with a motor or engine 25. (intransitive) slang to travel with great speed or force Word origin C13: from Anglo-Norman poer, from Vulgar Latin potēre (unattested), from Latin posse to be able |
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