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(botany) the arrangement of sepals and petals in a flower bud before it opens.(zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period.Aestivation in animals is a state of dormancy usually to assist in water regulation, where minimal activity results in retaining more water during the hottest parts of the day. These animals will find a shaded/underground area to do this.