Subordinate; secondary; auxiliary.
[…] how easily he took all things along with him,—the persons, the opinions, and the day, and nature became ancillary to a man.
Something that serves an ancillary function, such as an easel for a painter.
Auxiliaries and ancillaries are comprehensive, and include a Westinghouse motor-driven recriprocating compressor used for locomotive braking and general service air, two rotary exhauster sets for train brakes when hauling passenger or fitted freight trains, and an oil-fired train heating boiler.
An auxiliary.
From Latin ancillāris (“ancillary; relating to maids”), from ancilla (“maid”).
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