A host-specific lineage of a brood parasite species.^([W])
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 taxon at this rank.
A natural number representing any of several related measures of the complexity of a given manifold or graph.
A category in the classification of organisms, ranking below family (Lat. familia) and above species.
A group with common attributes.
Within a definition, a broader category of the defined concept.
A type of tuning or intonation, used within an Ancient Greek tetrachord.