centisecond

A centisecond is a unit of time equal to 0.01 seconds, or 10 milliseconds. It sits in the SI decimal hierarchy between the decisecond (0.1 s) above it and the millisecond (0.001 s) below it. The symbol is cs. In practice, centiseconds are almost never encountered in industrial measurement, which is why you will find them cited in reference tables but rarely in actual work.

The unit exists formally within the SI system but occupies an awkward middle ground. Milliseconds are precise enough for most timing work in manufacturing, electronics, and process control, while anything requiring coarser resolution uses deciseconds or full seconds. The centisecond has no natural application domain. Stopwatches and electronic timing displays skip over it entirely, moving directly from deciseconds to milliseconds. Even in historical contexts where centisecond notation appeared in older European technical literature, the practice has effectively died out.

Where it fails to appear

Mechanical and digital instruments simply do not use centisecond resolution. A typical industrial timer operates in either milliseconds (for fast processes like spark ignition or injection timing) or whole seconds and fractions thereof (for slower cycles). Film frame rates, which do generate unusual time units, work in frame counts and frequency, not centiseconds. The centisecond has no champions in any trade because no measurement problem is best solved at that particular scale.

If you encounter a centisecond in a specification or datasheet, treat it as a translation artifact or a sign that the original unit may have been unclear. Convert it directly to milliseconds (multiply by 10) or seconds (divide by 100) and move on. The centisecond survives as a unit only because SI completeness demands it, not because anyone needed it.