incidental
adjective
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following or accompanying as a consequenceattendant
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not of prime or central importancenonessential
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(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence“incidental expenses”incident
noun
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an item that is incidental
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an expense not budgeted or not specified, frequently seen in plural form“They requested reimbursement of $7 for incidental expenses.”incidental expenseminor expense