in line vs longitudinal

in line

adj
  • Positioned in a straight line. 

  • Suitable or appropriate; keeping with expectations, norms, ideals, or rules. 

  • assuming a position in the future. 

adv
  • one behind another; in a queue 

longitudinal

adj
  • Forward and/or backward, relative to some defined direction. 

  • Relating to length, or to longitude. 

  • Running in the direction of the long axis of a body. 

  • Sampling data over time rather than merely once. 

noun
  • Any longitudinal piece, as in shipbuilding etc. 

  • A railway sleeper lying parallel with the rail. 

How often have the words in line and longitudinal occurred in a corpus of books? (source: Google Ngram Viewer )