not of prime or central importance; "nonessential to the integral meanings of poetry"- Pubs.MLA
(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"
march in protest; take part in a demonstration; "Thousands demonstrated against globalization during the meeting of the most powerful economic nations in Seattle"
encountered generally especially at the present time; "the prevailing opinion was that a trade war could be averted"; "the most prevalent religion in our area"; "speculation concerning the books author was rife"