RSS

Short definition from Wiktionary

Proper noun

1. 1
   Initialism of Rich Site Summary / Really Simple Syndication (“mechanism to follow updates on other websites such as news, music, blogs, etc.”).
2. 2
   Initialism of RDF Site Summary.
3. 3
   Initialism of Republic of Singapore Ship (“prefix of Navy ships belonging to the Republic of Singapore Navy”).
4. 4
   Initialism of Rashtriya Swayamsevak Sangh (“Indian nationalist volunteer organization”).

Noun

1. 1
   Initialism of reusable spaceship.
2. 2
   Initialism of rapid response system.
3. 3
   Initialism of range safety system.
4. 4
   Initialism of residual sum of squares.