in parallel vs piecemeal

in parallel

prep
  • At the same time; together, concurrently, cotemporally. 

  • Aligned or connected side by side, instead of in series. 

piecemeal

verb
  • To divide or distribute piecemeal; dismember. 

noun
  • A fragment; a scrap. 

adv
  • Piece by piece; in small amounts, stages, or degrees. 

  • Into pieces or parts. 

adj
  • Made or done in pieces or one stage at a time. 

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