A micron is a Colonial measurement of time.
Analogous to an Earth split second (specifically, 0.6 seconds); plural form is "microns".
There are one hundred (100) microns, as opposed to sixty (60) Earth seconds, in one (1) centon.
Original Series definition: unit of time akin to a "second"; Microcenton is likely another term for "micron"; Starbuck uses this term when he says "switching off of you for a microcenton to scan ahead" (TOS: "Lost Planet of the Gods, Part II")