Is Deniability an English Word?

the ability to deny something, as knowledge of or connection with an illegal activity.

What does deniability mean?

: the ability to deny something especially on the basis of being officially uninformed.

Where did the term plausible deniability come from?

Although plausible deniability has existed throughout history, the term was coined by the CIA in the early 1960s to describe the withholding of information from senior officials to protect them from repercussions if illegal or unpopular activities became public knowledge.