Gigannum is a related term of kiloyear.
As a noun kiloyear is
(geology|science fiction) a millennium, a period of one thousand years.
gigannum
Not English
Gigannum has no English definition. It may be misspelled. kiloyear
English
Noun
(
en noun)
(geology, science fiction) A millennium, a period of one thousand years.
Synonyms
* See
Related terms
* megayear, mega-annum
* gigayear, gigannum