Thus Maggie was introduced for the first time to the young lady’s life, and knew what it was to get up in the morning without any imperative reason for doing one thing more than another.
Chapter VII Philip Re-enters The next morning was very wet,—the sort of morning on which male neighbors who have no imperative occupation at home are likely to pay their fair friends an illimitable visit.
There are no more uses of "imperative" in the book.
Show samples from other sources
I’m hoping to be able to reveal this to my father soon enough, but, for tonight, discretion is imperative."
Kiera Cass -- The One
The evolutionary imperative that drove them to live in groups was the opportunity to kill them by the billions.