- Noun. Sitting on eggs for the purpose of hatching young; a brooding on, or keeping warm, to develop the life within, by any process.
- Noun. (pathology) The development of a disease from its causes, or its period of incubation. (See below.).
- Noun. (chemistry) A period of little reaction which is followed by more rapid reaction.
- Noun. Sleeping in a temple or other holy place in order to have oracular dreams.