1. (noun)estivation, aestivation (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period Synonyms: aestivation, estivation
2. (noun)estivation, aestivation (botany) the arrangement of sepals and petals in a flower bud before it opens Synonyms: aestivation, estivation