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An act of tracing.
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An enquiry sent out for a missing article, such as a letter or an express package.
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A mark left as a sign of passage of a person or animal.
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A very small amount, often residual, of some substance or material.
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(electronics) A current-carrying conductive pathway on a printed circuit board.
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An informal road or prominent path in an arid area.
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One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whippletree attached to a vehicle or thing to be drawn; a tug.
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(engineering) A connecting bar or rod, pivoted at each end to the end of another piece, for transmitting motion, especially from one plane to another; specifically, such a piece in an organ stop action to transmit motion from the trundle to the lever actuating the stop slider.
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(fortification) The ground plan of a work or works.
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(geometry) The intersection of a plane of projection, or an original plane, with a coordinate plane.
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(mathematics) The sum of the diagonal elements of a square matrix.
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(grammar) An empty category occupying a position in the syntactic structure from which something has been moved, used to explain constructions such as wh-movement and the passive.
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(programming) A sequence of instructions, including branches but not loops, that is executed for some input data.