1 (Physics) any acoustic, optical, or microwave instrument that uses interference patterns or fringes to make accurate measurements of wavelength, wave velocity, distance, etc.
2 (Astronomy) a radio telescope consisting of two or more radio antennas separated by a known distance and connected to the same receiver so that radio waves from a source in space undergo interference, enabling the position of the source to be accurately determined
n a type of radio telescope in which two or more aerials connected to the same receiver produce interference patterns that can be analysed to provide information about the source of the radio waves
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