sid

noun1

1. •
   (slang) sadiki

adverb1

1. •
   once a day, such as for the administration of medication. From Latin semel in die.

noun3

1. •
   Sound Interface Device, a sound chip used in some early computers.
2. •
   Abbreviation of security identifier.

   • If the call to this function fails, you can assume the SID was invalid — even if it's a well-known SID. — 2003
3. •
   Initialism of standard instrument departure.