concatenating

/K AH0 N K AE1 T AH0 N EY0 T IH0 NG/
verb
  1. 1

    To join or link together, as though in a chain.

  2. 2

    To join (text strings) together.

    โ€œConcatenating "shoe" with "string" yields "shoestring".โ€

Source: https://en.wiktionary.org/wiki/concatenate, https://en.wiktionary.org/wiki/concatenating