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| total opposition to alternating current by an electric circuit |
| voltage that reverses direction in regular cycles |
| expander (ɪkˈspændə) | |
| —n | |
| 1. | a device for exercising and developing the muscles of the body: a chest expander |
| 2. | compressor Compare compander an electronic device for increasing the variations in signal amplitude in a transmission system according to a specified law |