01 a. Happening, as an occasional event, without regularity; coming without design; casual; accidental; hence, not of prime concern; subordinate;…
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1.
Happening, as an occasional event, without regularity; coming without design; casual; accidental; hence, not of prime concern; subordinate; collateral; as, an incidental conversation; an incidental occurrence; incidental expenses.“By some, religious duties . . . appear to be regarded . . . as an incidental business.” — Rogers.“I treat either or incidentally of colors.” — Boyle.
Syn.
Accidental; casual; fortuitous; contingent; chance; collateral. See Accidental.