Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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cost-plus the sum of the actual costs of manufacture and a previously fixed profit. [2 definitions]
doubles plus one in mathematics education, involving the addition of consecutive numbers by doubling the smaller number and adding one.
ne plus ultra (Latin) the highest point, esp. of achievement or excellence; ultimate.
plus fours long, loose knickerbockers that are baggy below the knee.
plus sign a mathematical sign (+) indicating addition or a positive quantity.