| 单词 | group |
| 释义 | group n. & v. --n 1. a number of persons or things located close together, or considered or classed together. 2. (attrib.) concerning or done by a group (a group photograph; group sex). 3. a number of people working together or sharing beliefs, e.g. part of a political party. 4. a number of commercial companies under common ownership. 5. an ensemble playing popular music. 6. a division of an air force or air-fleet. 7. Math. a set of elements, together with an associative binary operation, which contains an inverse for each element and an identity element. 8. Chem. a a set of ions or radicals giving a characteristic qualitative reaction. b a set of elements having similar properties. c a combination of atoms having a recognizable identity in a number of compounds. --v 1. tr. & intr. form or be formed into a group. 2. tr. (often foll. by with) place in a group or groups. 3. tr. form (colours, figures, etc.) into a well-arranged and harmonious whole. 4. tr. classify. Phrases and idioms group captain an RAF officer next below air commodore. group dynamics Psychol. the field of social psychology concerned with the nature, development, and interactions of human groups. group practice a medical practice in which several doctors are associated. group therapy therapy in which patients with a similar condition are brought together to assist one another psychologically. group velocity the speed of travel of the energy of a wave or wave-group. Derivatives groupage n. Etymology: F groupe f. It. gruppo f. Gmc, rel. to CROP |
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