lineally


lin·e·al

L0180100 (lĭn′ē-əl)adj.1. Belonging to or being in the direct line of descent from an ancestor.2. Derived from or relating to a particular line of descent; hereditary.3. Linear.
[Middle English, from Old French, from Late Latin līneālis, consisting of lines, from Latin līnea, line; see line1.]
lin′e·al·ly adv.
Thesaurus
Adv.1.lineally - by an unbroken line of descent; "she is related lineally to the Royal Family"