of the highest/first order

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of the first order (or magnitude)

used to denote something that is excellent or considerable of its kind.
In astronomy, magnitude is a measure of the degree of brightness of a star. Stars of the first magnitude are the most brilliant.
See also: first, of, order

of the highest/first ˈorder

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of a high ˈorder

of the best, worst, most extreme, etc. type: It was a scandal of the first order.
See also: first, high, of, order