From pattern +‎ -ing.

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patterning

1. present participle and gerund of pattern

patterning (countable and uncountable, plural patternings)

1. A pattern; the production of a pattern; the process of forming a pattern.
   • 1905, William Hurrell Mallock, The Reconstruction of Belief, page 151:

     […] the tesseræ will form patterns which for us are wholly meaningless, yet the patterning in every case is equally specific and inevitable, implying the pattern above it, implied in that below […]

   • 2015, Kim Williams, Michael J. Ostwald, Architecture and Mathematics from Antiquity to the Future, page 460:

     Any system of geometric patterning that covers or fills a surface using a finite set of shapes is considered tiling in a mathematical sense.

2. Emulation, following as a model; frequently with after.
   • 1916, H.W. Nutt, “Genetic psychology of suggestion as a factor in human behavior”, in Teacher’s Journal, page 793:

     When it is serious it leads to a copying after the manners and personal habits of elders, and a patterning after the style of dress in those whom the children admire.

   • 2001, Douglas Webster, A Passion for Christ, page 66:

     His name became synonymous with God himself. Therefore, to be called by his name involved an inseparable commitment to a patterning after his life and a confession of his being.