intervention

1. (US, law) A legal motion through which a person or entity who has not been named as a party to a case seeks to have the court order that they be made a party.UScountableuncountable

2. (medicine) An action taken or procedure performed; an operation.Examples: "As I showed, although some rhetoricians, such as Mesmer and Erb, claimed that their interventions were medical treatments, others, such as Freud and Jung, claimed that their interventions were both medical curings and spiritual carings."; "“It goes with my mantra of there is ‘no magic pill’ to prevent cognitive decline,” said Isaacson, who was not involved in the new study. “At my clinic, we check nutritional blood measures and personally tailor interventions, and in doing so we don’t tend to recommend multivitamins since we address the individual deficiencies.”"countableuncountable