[L. caret (there) is wanting, f. carēre to be in want of.]

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  A mark (‸) placed in writing below the line, to indicate that something (written above or in the margin) has been omitted in that place.

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1710.  W. Mather, Yng. Man’s Comp. (1727), 38. That which is called Caret (that is to say in English, it is wanting) markt with a Latine Circumflex, thus (‸) which is to shew where a Word forgotten … and placed above the Line, is to come in.

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1824.  J. Johnson, Typogr., II. viii. 218. Should a letter have been omitted, a caret is put at the place.

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1870.  Lowell, Study Wind. (1886), 301. Like the carets on a proof-sheet.

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