Noun

• S: (n) eon, aeon (the longest division of geological time)
• part meronym
• S: (n) era, geological era (a major division of geological time; an era is usually divided into two or more periods)
• has instance
• direct hypernym / inherited hypernym / sister term
• S: (n) geological time, geologic time (the time of the physical formation and development of the earth (especially prior to human history))
• S: (n) eon, aeon (the longest division of geological time)
• S: (n) period, geological period (a unit of geological time during which a system of rocks formed) "ganoid fishes swarmed during the earlier geological periods"
• S: (n) era, geological era (a major division of geological time; an era is usually divided into two or more periods)
• part meronym
• has instance
• direct hypernym / inherited hypernym / sister term
• part holonym
• S: (n) epoch (a unit of geological time that is a subdivision of a period and is itself divided into ages)
• derivationally related form
• S: (n) eon, aeon (an immeasurably long period of time) "oh, that happened eons ago"
• S: (n) eon, aeon ((Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe)
• domain category
• direct hypernym / inherited hypernym / sister term