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monophyly
This term is a specialized technical descriptor used almost exclusively within the fields of phylogenetics and evolutionary biology. It describes a specific topological relationship in a phylogenetic tree where a single common ancestor is shared by all members of a group, and no descendants are excluded. It carries a neutral, scientific connotation, serving as the gold standard for defining a valid biological clade.
Because it describes a state or condition of a group, it is treated as an uncountable noun. It is frequently contrasted with polyphyly or paraphyly, which describe groups that do not meet the strict criteria of having a single common ancestor and all its descendants.