geologic time

English Thesaurus

1. the time of the physical formation and development of the earth (especially prior to human history) (noun.time)

hypernym	:	time,
definition	:	the continuum of experience in which events pass from the future through the present to the past (noun.tops)

hyponym	:	aeon, eon,
definition	:	the longest division of geological time (noun.time)

hyponym	:	geological period, period,
definition	:	a unit of geological time during which a system of rocks formed (noun.time)

hyponym	:	era, geological era,
definition	:	a major division of geological time; an era is usually divided into two or more periods (noun.time)

hyponym	:	epoch,
definition	:	a unit of geological time that is a subdivision of a period and is itself divided into ages (noun.time)