Meaning of LASER in English

LASER

noun Usage: often attributive Etymology: light amplification by stimulated emission of radiation Date: 1957 a device that utilizes the natural oscillations of atoms or molecules between energy levels for generating a beam of coherent electromagnetic radiation usually in the ultraviolet, visible, or infrared regions of the spectrum, something resembling a ~ beam in accuracy, speed, or intensity

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.