To provide a record of every step, or selected steps, executed by a computer program, and by extension, the record produced by this operation.

The visible path of a moving spot on the screen of a cathode-ray tube. Also known as line.

The record made by a recording device, such as a seismometer or electrocardiograph.

The intersection of two geological surfaces.

1. The trace of a matrix is the sum of the entries along its principal diagonal.Designated Tr. Also known as spur.

2. The trace of a linear transformation on a finite-dimensional vector space is the trace (in the sense of the first definition) of the matrix associated with it.

3. One of the curves along which a given surface cuts a coordinate plane.

4. A point at which a given straight line in space passes through a coordinate plane. Also known as piercing point.

5. The projection of a given straight line in space on a coordinate plane.

A precipitation of less than 0.005 inch (0.127 millimeter).

An extremely small but detectable quantity of a substance.