Verb
To affirm or aver positively, or with solemnity.
Source: Webster's dictionaryA natural scientist, examining a single atom, might well be able to asseverate the structure and history of the entire universe!" Bah!" muttered Hurtiancz. "By the same token, a sensible man need listen to but a single word in order to recognize the whole for egregious nonsense. Jack Vance
A natural scientist, examining a single atom, might well be able to asseverate the structure and history of the entire universe! Jack Vance