Producing young in a living state, as most mammals, or as those plants the offspring of which are produced alive, either by bulbs instead of seeds, or by the seeds themselves germinating on the plant, instead of falling, as they usually do; -- opposed to oviparous.
- Zoology Giving birth to living offspring that develop within the mother's body. Most mammals and some other animals are viviparous.
- Botany Germinating or producing seeds that germinate before becoming detached from the parent plant, as in the mangrove.
- Botany Producing bulbils or new plants rather than seed, as in the tiger lily.