/ ænˈsɪləri; NAmE ˈænsəleri/ adjective ancillary (to sth)
1.
providing necessary support to the main work or activities of an organization
SYN auxiliary :
ancillary staff / services / equipment
ancillary workers in the health service such as cooks and cleaners
2.
in addition to sth else but not as important :
ancillary rights
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WORD ORIGIN
mid 17th cent.: from Latin ancillaris , from ancilla maidservant.