What is the meaning of simulate?

verb

• Reproduce someone's behavior or looks.
  • usage: "The mime imitated the passers-by"; "Children often copy their parents or older siblings"
  • synonyms: imitate, copy
• Create a representation or model of.
  • usage: "The pilots are trained in conditions simulating high-altitude flights"
  • synonyms: model
• Make a pretence of.
  • usage: "She assumed indifference, even though she was seething with anger"; "he feigned sleep"
  • synonyms: assume, sham, feign