Definitions

1. adjective

being or serving as a conclusive or absolute proof; completely certain or undeniable

“The apodeictical nature of the mathematical theorem made it a cornerstone of the course.”

2. adverb

in a completely certain or undeniable manner

“The data was analyzed apodeictically to eliminate any room for doubt.”

3. noun

a conclusion or proof that is completely certain or undeniable

“The apodeictical evidence led to the conviction of the defendant.”