S: (n) window (an opening that resembles a window in appearance or function) "he could see them through a window in the trees"
S: (n) window (the time period that is considered best for starting or finishing something) "the expanded window will give us time to catch the thieves"; "they had a window of less than an hour when an attack would have succeeded"
S: (n) time period, period of time, period (an amount of time) "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"