cad-, cas-, cid-

1. The state or fact of occupying the same relative position or area in space.
2. A sequence of events that although accidental seems to have been planned or arranged.
3. An event that might have been arranged although it was really accidental; happenstance.
4. The quality of occupying the same position or area in space.
5. The temporal property of two things happening at the same time; concurrence, conjunction, co-occurrence.

1. To break down into component parts; rot.
2. In physics, to disintegrate or diminish by radioactive decay.
3. In electronics, to decrease gradually in magnitude with reference to voltage or current.
4. In aerospace, to decrease in orbit; referring to an artificial satellite.
5. To fall into ruin; such as, a civilization that started to decay.
6. In pathology, to decline in health or vigor; to waste away.
7. Declining from a state of normality, excellence, or prosperity; to deteriorate.

1. The organic phenomenon of having rotted.
2. Damaged by decay; hence, unsound and useless.
3. Organic matter which has been destroyed or decomposed; as a result of bacterial or fungal action; that which has become rotten.

1. The destruction or decomposition of organic matter as a result of bacterial or fungal action; rot.
2. Causing rotted matter which becomes decomposed; such as, vegetation that was decaying.
3. In physics, radioactive decay.
4. In aerospace, the decrease in orbital altitude of an artificial satellite as a result of conditions; such as, atmospheric drag.
5. A gradual deterioration to an inferior state; such as, tooth decay; urban decay.
6. A falling into ruin.

1. Falling off or the shedding at a specific season; such as, trees and bushes that shed their leaves in the fall.
2. Describes the teeth, antlers, or wings of animals and birds that are shed after a stage of development.
3. Describing the scales of fish that are shed easily or at intervals.
4. Falling; not perennial or permanent.

In botany, a deciduous leaf is one which falls in autumn; a deciduous calyx, is something which falls after the corol opens; distinguished from being permanent.

1. Falling off or shedding seasonally or at a certain stage of development in the life cycle of plants animal parts, etc.
2 Having deciduous parts; such as, maples, birches, and other deciduous trees.