Meaning of PRECAMBRIAN PERIOD

WordNet Dictionary
	Definition:		[n]  the geological era before about 544 million years ago
	Synonyms:		Precambrian
	See Also:		Archaeozoic, Archaeozoic era, Archean, Archean era, Archeozoic, Archeozoic era, era, geological era, Preoterozoic era, Proterozoic