It means something impossible to deny or disprove. An incontrovertible fact.
In the sentence 'Can you give a definition for that word?', YOU is the subject.
How can I give definition of this word? What is the definition of merc?
That is the correct spelling of the word "undeniable" (irrefutable).
No, it is not a word. But if you give it a definition, you could make it a word...
The word is definition.
Definition.
Definition, (n) A description of the meaning of a word. That was an example.
Irrefutable means cannot be disproved or dissagreed with.
google.com
boang ka
that cannot be refuted or disproved: irrefutable logic.
it means the same as center.