A legally defined unit of Roman society, being a collection of people related through a common ancestor by birth, marriage or adoption, possibly over many generations, and sharing the same nomen gentilicium.
A tribal subgroup whose members are characterized by having the same descent, usually along the male line.
A host-specific lineage of a brood parasite species.^([W])
A class of society composed of people with similar social, cultural, or economic status.
One of several parallel horizontal layers of material arranged one on top of another.
A layer of sedimentary rock having approximately the same composition throughout.
Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
A layer of vegetation, usually of similar height.
The level of accuracy of a computer's clock, relative to others on the network.
A layer of tissue.