assert
verb (used with object)
to state with assurance, confidence, or force; state strongly or positively; affirm; aver.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Apparently the King either has a right, assertible as such to the death, before God and man; or else he has no right.
From The French Revolution by Carlyle, Thomas