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1. An operating system that is on a disk
   - disk operating system

1. The federal department in the United States that sets and maintains foreign policies
   "the DoS was created in 1789";
   - Department of State, United States Department of State, State Department, State

1. The syllable naming the first (tonic) note of any major scale in solmization
   - doh, ut
    
2. A party or social event
   - bash [informal]
    
3. [informal] The arrangement of the hair (especially a woman's hair)
   - hairdo [informal], hairstyle, hair style, coiffure, coif

Type of: executive department, hair, operating system, OS, party, solfa syllable

Encyclopedia: DOS