Noun

• S: (n) ice age, glacial period, glacial epoch (any period of time during which glaciers covered a large part of the earth's surface) "the most recent ice age was during the Pleistocene"
• direct hypernym / inherited hypernym / sister term
• 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) geological time, geologic time (the time of the physical formation and development of the earth (especially prior to human history))
• S: (n) time (the continuum of experience in which events pass from the future through the present to the past) "he waited for along time"; "it took some time before he got an answer"; "time flies like an arrow"
• S: (n) attribute (an abstraction belonging to or characteristic of an entity)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• part holonym