SID

• IPA^(key): /ɛs aɪ diː/

SID (plural SIDs)

1. (computing, Microsoft Windows) Abbreviation of security identifier.
   • 2003, John Mueller, .NET development security solutions:

     If the call to this function fails, you can assume the SID was invalid — even if it's a well-known SID.

2. (computing) Sound Interface Device, a sound chip used in some early computers.
3. (aviation) Initialism of standard instrument departure.
4. (medicine) once a day, such as for the administration of medication. From Latin semel in die.

• dis, Dis, IDs, DIs, SDI, dIs, dis-, 'dis, I-Ds, ISD, DSI, IDS, DIS, ids, I.D.s