Definition of "RSS"

RSS

proper noun
1. (Internet) Initialism of Rich Site Summary / Really Simple Syndication (“mechanism to follow updates on other websites such as news, music, blogs, etc.”).
  Quotations
  Another theory is that RSS was always too geeky for regular people. Even the New York Times, which seems to have been eager to adopt RSS and promote it to its audience, complained in 2006 that RSS is a “not particularly user friendly” acronym coined by “computer geeks.”
  2019 January 9, Sinclair Target, “The Rise and Demise of RSS”, in Motherboard‎
2. (Internet, deprecated) Initialism of RDF Site Summary.
3. (military, nautical, Singapore) Initialism of Republic of Singapore Ship (“prefix of Navy ships belonging to the Republic of Singapore Navy”).
4. (Indian politics, Hindutva) Initialism of Rashtriya Swayamsevak Sangh (“Indian nationalist volunteer organization”).
noun
plural RSSes
1. (aerospace) Initialism of reusable spaceship.
2. (medicine) Initialism of rapid response system.
3. (astronautics) Initialism of range safety system.
4. (statistics) Initialism of residual sum of squares.