w.r.t.

/W R T/
preposition
  1. 1

    Initialism of with reference to.

preposition
  1. 1

    Concerning; about.

    โ€œI am writing with regard to the advertisement that you placed in last week's Daily News.โ€

preposition
  1. 1

    Regarding; concerning; pertaining to.

  2. 2

    Taking as the independent variable.

    โ€œTo calculate acceleration, you need to differentiate velocity with respect to time.โ€

Source: https://en.wiktionary.org/wiki/WRT, https://en.wiktionary.org/wiki/w.r.t., https://en.wiktionary.org/wiki/with%20regard%20to, https://en.wiktionary.org/wiki/with%20respect%20to