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Adjective incidental has 3 senses
incidental, incident - (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence; "incidental expenses"; "the road will bring other incidental advantages"; "extra duties incidental to the job"; "labor problems incidental to a rapid expansion"; "confusion incidental to a quick change"Antonyms:  basic, basal, base, elementary, primary, fundamental, rudimentary, underlying, grassroots, radical
 
accompanying, attendant, concomitant, incidental, incidental to - following as a consequence; "an excessive growth of bureaucracy, with related problems"; "snags incidental to the changeover in management"Antonym:  unrelated (indirect, via related)
 
incidental, nonessential - not of prime or central importance; "nonessential to the integral meanings of poetry"- Pubs.MLAAntonym:  essential (indirect, via inessential)
 
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