1.  dos(n = noun.group) department of state, state, state department, united states department of state - the federal department in the United States that sets and maintains foreign policies; "the Department of State was created in 1789"
is a kind of executive department
has parts: bureau of diplomatic security, ds, foreign service, bureau of intelligence and research, inr
has particulars: foggy bottom

2.  dos(n = noun.communication) disk operating system - an operating system that is on a disk;
is a kind of operating system, os
has particulars: microsoft disk operating system, ms-dos

dos, n. Computing a program for manipulating information on a disk.

Etymology:
abbr. of disk operating system

dos passos, john dos passos, john roderigo dos passos, sao jose dos campos