1. A gradual deviation from a set adjustment, such as frequency or balance current, or from a direction.

2. The deviation, or the angle of deviation, of a borehole from the vertical or from its intended course.

3. To measure the size of a pipe opening by passing a mandrel through it.

1. Rock material picked up and transported by a glacier and deposited elsewhere.

2. Detrital material moved and deposited on a beach by waves and currents.

The water lost in a cooling tower as mist or droplets entrained by the circulating air, not including the evaporative loss.

A horizontal mine opening which follows a vein or lies within the trend of an ore body. Also known as gallery.

1. The movement of a craft caused by the action of wind or current.

2. To move gradually from a set position without control.

See <<drift current>>

The movement of current carriers in a semiconductor under the influence of an applied voltage.