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How to sign: something added to another thing but not an essential part of it
Categories: frill, frill, inessential, nonessential
How to sign: relating to something that is added but is not essential
"an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxilliary to each other";
Similiar / Same: accessory, ancillary, adjuvant, appurtenant, subsidiary, auxiliary