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1. In fiber optics, a band of wavelengths at which an optical fiber is sufficiently transparent for practical use in communications applications. [After FAA] Synonyms spectral window, transmission window. See first window, second window, third window. 2. In imagery, a portion of a display surface in which display images pertaining to a particular application can be presented. Note: Different applications can be displayed simultaneously in different windows. 3. A period during which an event can occur, can be expected to occur, or is allowed to occur.