emergent
Coming into view or into existence; nascent; new.
Arising unexpectedly, especially if also calling for immediate reaction.
(especially medicine) Constituting an emergency.
(botany) Taller than the surrounding vegetation.
(botany, of a water-dwelling plant) Having leaves and flowers above the water.
(video games) Having gameplay that arises from its mechanics, rather than a linear storyline.
(philosophy, sciences) Having properties as a whole that are more complex than the properties contributed by each of the components individually.
(botany) A plant whose root system grows underwater, but whose shoot, leaves and flowers grow up and above the water.