"gestation" in the noun sense
1. gestation, gestation period
the period during which an embryo develops (about 266 days in humans)
2. pregnancy, gestation, maternity
the state of being pregnant the period from conception to birth when a woman carries a developing fetus in her uterus
3. gestation
the conception and development of an idea or plan
Source: WordNet® (An amazing lexical database of English)
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