std

Short definition from Wiktionary

Noun

1. 1
   Abbreviation of standard.
2. 2
   Abbreviation of standard deviation.
3. 3
   Standard library.
4. 4
   Initialism of sexually transmitted disease.
5. 5
   Initialism of subscriber trunk dialling or subscriber toll dialing.
6. 6
   Initialism of short-term disability.
7. 7
   Initialism of save the date.

Adjective

1. 1
   Alternative form of std (“standard”).