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lineage
/ˈlɪ.ni.ɪdʒ/
Lineage carries a sense of continuity and prestige that "family tree" lacks. It evokes an image of an unbroken chain stretching back through time, often implying a legacy, status, or a specific biological inheritance. In human contexts, it is more formal than "ancestry" and is frequently used when discussing nobility, royalty, or ancient heritage where the exact sequence of descent is significant. In scientific or intellectual contexts, it describes a developmental path. It focuses on the trajectory of evolution or the transmission of an idea from one iteration to the next, emphasizing the causal link between the predecessor and the successor.
Uncountable when referring to the general concept of ancestry ('of royal lineage'). Countable when identifying a specific chain of descent or a distinct evolutionary branch ('the primate lineage').