From Planet X
1. A visible mark, such as a footprint, made or left by the passage of a person, an animal, or a thing. 2. Evidence or an indication of the former presence or existence of something; a vestige. 3. spoke with a trace of sarcasm. 4. An extremely small amount. 5. A constituent, such as a chemical compound or element, present in quantities less than a standard limit. 6. A path or trail that has been beaten out by the passage of animals or people. 7. A way or route followed. 8. A line drawn by a recording instrument, such as a cardiograph. 9. The point at which a line, or the curve in which a surface, intersects a coordinate plane. 10. The sum of the elements of the principal diagonal of a matrix. 11. An engram. 12. trace a wounded deer; tracing missing persons. 13. tracing the life cycle of an insect; trace the history of a family. 14. trace the cause of a disease. 15. To draw (a line or figure); sketch; delineate. 16. To form (letters) with special concentration or care. 17. To copy by following lines seen through a sheet of transparent paper. 18. To imprint (a design) by pressure with an instrument on a superimposed pattern. 19. To make a design or series of markings on (a surface) by such pressure on a pattern. 20. To record (a variable), as on a graph. 21. traced through the files. 22. linguistic features that trace to West Africa.