Definition of "SEC"

SEC

proper noun
1. (US, government, finance) Initialism of Securities and Exchange Commission.
  Quotations
  “Anyway, Kaspersky took her story to the SEC. I’m sorry, it’s rude to throw obscure acronyms around. I mean the Securities and Exchange Commission. They’re the people who look after my industry.” Vincent knew what the SEC was, because she made an effort to follow the financial news, but she only nodded.
  2020, Emily St. John Mandel, The Glass Hotel, Picador (2021), page 71
2. (US, college, sports) Abbreviation of Southeastern Conference, a college athletics conference
3. (Australia) Initialism of State Electricity Commission.