lineally

Adverb

lineally (not comparable)

1. In terms of lines; linewise.
   • For copying drawings to a scale differing from the original; e.g., to reduce a drawing, lineally, one fifth: […]1888, Henry Albert Reed, Topographical Drawing and Sketching, page 9
2. (genealogy) By direct descent.
   • […] I confess it was not without some pleasure that I found my self able to trace the particular Features, by which certain Families are distinguished, up to their Originals. I could plainly discover from whence one Family derives a long Chin […]. Who first brought the Pox into a noble House, which...1726, Jonathan Swift, Travels into Several Remote Nations of the World, London: Benjamin Motte, Volume 2, Part 3, Chapter 8, pp. 108-109
   • Of the Rev. Mr. Slope’s parentage I am not able to say much. I have heard it asserted that he is lineally descended from that eminent physician who assisted at the birth of Mr. T. Shandy, and that in early years he added an "e" to his name, for the sake of euphony, as other great men have done...1857, Anthony Trollope, chapter 4, in Barchester Towers