| 单词 | unit |
| 释义 | unit /yooh"nit/, n. 1. a single thing or person. 2. any group of things or persons regarded as an entity: They formed a cohesive unit. 3. one of the individuals or groups that together constitute a whole; one of the parts or elements into which a whole may be divided or analyzed. 4. one of a number of things, organizations, etc., identical or equivalent in function or form: a rental unit; a unit of rolling stock. 5. any magnitude regarded as an independent whole; a single, indivisible entity. 6. Also called dimension. any specified amount of a quantity, as of length, volume, force, momentum, or time, by comparison with which any other quantity of the same kind is measured or estimated. 7. the least positive integer; one. 8. Also called unit's place. a. (in a mixed number) the position of the first digit to the left of the decimal point. b. (in a whole number) the position of the first digit from the right of the decimal point. 9. a machine, part, or system of machines having a specified purpose; apparatus: a heating unit. 10. Educ. a division of instruction centering on a single theme. 11. Mil. an organized body of soldiers, varying in size and constituting a subdivision of a larger body. 12. Med. a. the measured amount of a substance necessary to cause a certain effect; a clinical quantity used when a substance cannot be readily isolated in pure form and its activity determined directly. b. the amount necessary to cause a specific effect upon a specific animal or upon animal tissues. 13. Math. a. an identity element. b. an element in a group, ring, etc., that possesses an inverse. [1570; coined by John Dee as a trans. of Gk mónas (previously rendered as unity); perh. influenced by digit] |
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