chrono-, chron-

(Greek: time, times; sequence of times)

panchronic (adjective) (not comparable)
1. Pertaining to or designating linguistic study applied to all languages at all stages of their development.
2. Relating to not being restricted to a specific point in time.
pantochronometer (s) (noun), pantochronometers (pl)
An instrument which functions as a compass, a sundial, or the universal time dial.
parachronism, parachronistic
An error in chronology; usually taken as one in which an event, etc., is referred to a later date than the true one.
parachronology
A geochronology based on fossils that either supplement or take the place of biostratigraphically significant fossils.
photochronograph
1. An instrument for taking a series of instantaneous photographs at regular short intervals of time; also, each of the photographs so taken.
2. An instrument by which a beam of light is caused to produce a photographic image at some precise instant of time; for example, so as to show the exact time at which a star crosses the meridian.
photochronography
The art of recording or measuring intervals of time with the photochronograph.
plastochron
The interval of time between consecutive formations of leaf primordia (or of pairs of such primordia) in a growing shoot apex of a plant.
plesiochronous
Derived from the Greek plesio, "near, close", and chronos, "time", and refers to the fact that plesiochronous systems run in a situation when different parts of the system are almost, but not quite perfectly, synchronized.

Almost synchronous refers to a transmission where the sending and receiving devices are synchronized, but set to different clocks. Although the bits may not arrive in the same time slot as they were sent, as long as they arrive within a certain, defined range, the transmission is said to be plesiochronous (ples" ee AH kroh nuhs).

The term is used in the Plesiochronous Digital Hierarchy (PDH), the widely-used system in which the transmissions from one continent (such as, North America) are internetworked with transmissions in other continents (such as, Europe) by making small adjustments in the differing data rates between the systems. The European and American versions of the PDH system differ slightly in the details of their functions, but the principles are the same.

A plesiochronous situation can arise when two systems have slightly different clock readings over time. In such circumstances, one of the components, or a third system, would need to notice the mismatch and make some compensating adjustments; such as, repeating or deleting a data packet or frame.

—Based on information from PC Magazine.com,
Wikipedia, the free encyclopedia;
SearchNetworking.com; and Answers.com.
plesiochronous communications
Nearly synchronized, a term describing a communication system where transmitted signals have the same nominal digital rate but are synchronized on different clocks.
plesiosynchronous
Nearly simultaneous; (broadly) happening at the same time.
polychronicon
A chronicle of many events or periods.
prochronic, prochronism
1. Pertaining to a period before time began.
2. The dating of an event as earlier than its actual occurrence.
pseudochronism
A false dating, an error in date.
pseudochronology
psychochronometry
The study of mental processes in relation to their timing and duration.