Final answer:
The most similar definition of 'prominent' in the context of the quote is 'standing out'
Step-by-step explanation:
The most similar definition of 'prominent' in the context of the quote would be 'standing out'. In this case, it means that Soviet history books were rewritten to give him a more significant or notable role in the revolution and to emphasize other aspects of his life.
Learn more about Defining the meaning of a word in a historical context