trace

(noun): An act of tracing.
(noun): An enquiry sent out for a missing article, such as a letter or an express package.
(noun): A mark left as a sign of passage of a person or animal.
(noun): A residue of some substance or material.
(noun): A very small amount.
(noun): A current-carrying conductive pathway on a printed circuit board.
(noun): An informal road or prominent path in an arid area.
(noun): 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.
(noun): 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.
(noun): (fortification) The ground plan of a work or works.
(noun): The intersection of a plane of projection, or an original plane, with a coordinate plane.
(noun): The sum of the diagonal elements of a square matrix.
(noun): (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.