gigaannum

plural gigaannums

1. alternativeAlternative spelling of giga-annum (“gigayear, a billion years”).

   It is noteworthy that biological phenomena occur at scales ranging from nanometers to megameters, and from nanoseconds to gigaannums.

   2017, Ashok K. Goel et al., “Is Biologically Inspired Design Domain Independent?”, in John S. Gero, editor, Design Computing and Cognition ’16, →ISBN, page 157

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   Studies of the Earth’s processes, phenomena, and origins are unique in the physical sciences for their need to observe and measure past events over spatial and temporal scales that range from the micron and second to the astronomical unit and gigaannum.

   2013 February, Mark D. Schmitz, Klaudia F. Kuiper, “High-Precision Geochronology”, in Elements, volume 9, number 1, →DOI, page 25

   The oldest materials ever found in the Solar System occur in meteorites ~4.57 Ga (gigaannum or billion years ago) of age, marking the starting point for the condesation of the first solids in our Solar System.

   2016, Terry J. Henderson, Harry Salem, “The Atmosphere: Its Developmental History and Contributions to Microbial Evolution and Habit”, in Harry Salem, Sidney Katz, editors, Aerobiology: The Toxicology of Airborne Pathogens and Toxins, →ISBN, page 3