chrono-, chron-

(Greek: time, times; sequence of times)

geochronological
A reference to the chronology, or time sequences, of the earth's history as determined by geological events.
geochronologist
Someone who studies the chronology, or time periods, of the earth, as based on both absolute and relative methods of age determination.
geochronology
1. The chronology of the earth; that is, the measurement of geological time and the ordering of past geological events.
2. The time sequence of the earth’s history as governed by geological events.
3. The science of dating and the study of time in relation to the earth's history as revealed by geological data.
geochronometric
A reference to the measurement of an interval of time in relation to the history of the earth, using absolute or relative dating techniques.
geochronometry
1. An extension of geometry conceived as taking time into account as the fourth dimension; the geometry of space-time.
2. Absolute geochronology, in which events are assigned (approximate) dates in relation to the present instead of to other events.
3. Measurement of geologic time, as through isotopic-radioactive decay.
geological chronology, geologic chronology
Specifically, the dating of archaeological data in association with a geological deposit or formation; such as, the dating of Pleistocene human remains in the context of glacial advances and retreats.
geosynchronous
Any equatorial satellite with an orbital velocity equal to the rotational velocity of the earth resulting in a satellite that is apparently motionless for any observer on the earth.

A geosynchronous satellite has an orbit similar to a geostationary one, except that it does not necessarily lie in the earth's equatorial plane.

glottochronological
A reference to the study of the evolution of languages from a common source.
glottochronology
1. The application of statistics to vocabulary to determine the degree of relationship between two or more languages and the time of their splitting off from a common ancestor.
2. The determination of how long ago different languages evolved from a common source language.

The branch of lexicostatistics that studies the rate of the replacement of vocabulary and attempts to determine what percentage of basic vocabulary two presently distinct, but related languages share, using the information that is obtained to estimate how long ago they ceased being a single language.

heterochron
Having varying chronaxies.
heterochronia
1. Occurring at different times; irregular; intermittent; applied to the pulse.
2. The occurrence of a process, or development of a tissue, organ, or organic form, at an abnormal time.
3. Origin or development of tissues or organs at an unusual time or out of the regular sequence.
heterochronia, heterochronism, heterochronous, heterochrony
The occurrence of a process, or development of a tissue, organ, or organic form, at an abnormal time or out of a regular sequence.
heterochronic
1. Occurring at different times; irregular; intermittent: applied to the pulse.
2. Occurring or developed at an abnormal time.
homochronous
Occurring at the same time, age in successive generations, or at corresponding times; simultaneous.
isochron
1. A line (imaginary or on a map) connecting points at which a particular event occurs or occurred at the same time.
2. A line (imaginary or on a map) connecting points on the sea-floor formed at the same time.