Answer: The denotation of the word "fierceness" in this excerpt is "aggression".
Step-by-step explanation: The word "fierceness" is a noun and, in the excerpt provided, it makes reference to the quality of being frightening and aggressive. Therefore, the denotation of this word, that is to say the primary meaning of this word, is "aggression". Moreover, in this excerpt, 'fierceness' is found next to 'wrath', whose definition is 'great anger' and; therefore, has a similar meaning to 'fierceness'. Both 'fierceness' and 'wrath' have been used to refer to Almighty God,