the time when something begins (especially life); "they divorced after the birth of the child"; "his election signaled the birth of a new age" 何か（特に生命あるもの）が始まった時間。
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【上位】 the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her" 何かが始まるとされる時間。
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【上位】 an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago" 何かが1つの状態または段階からもう一つに通過するときに、起こる出来事。
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【下位】 the production of eggs (especially in birds) 卵の生産（特に鳥で）。
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【下位】 sitting on eggs so as to hatch them by the warmth of the body 体の温かさによって卵をかえすために卵の上に座ること。
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【下位】 concluding state of pregnancy; from the onset of contractions to the birth of a child; "she was in labor for six hours" 妊娠状態を終えること。陣痛の始まりから子供の誕生まで。
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