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"
S: (v) begin, start (have a beginning, in a temporal, spatial, or evaluative sense) "The DMZ begins right over the hill"; "The second movement begins after the Allegro"; "Prices for these homes start at $250,000"