This is the 870th most frequent Czech word.
třikrát
"Three times."
třikrát is used as an adverb to indicate the repetition of an action or event, in this case referring to the number of times the book was read.
Přečetl jsem tu knihu třikrát.
I read the book three times.
Here, třikrát describes the frequency of an action within a specific time frame, indicating repetition over a span of time.
Cvičil jsem třikrát týdně.
I exercised three times a week.
In this case, třikrát is used to indicate the sequential repetition of an action.