Adjective

Among the many advantages of legislation requiring a label was that it allowed the industry to insist—in court if necessary—that claims against the companies for negligence and deception were now moot . Every smoker would be repeatedly warned that "smoking may be hazardous to your health." — Allan M. Brandt , The Cigarette Century ,

And the question of delight shouldn't be moot . — Edward Hoagland , Harper's ,

… a genuine Atlantic political culture might be the result—rendering the fears expressed in this article largely moot . — John O'Sullivan , National Review ,

The court ruled that the issue is now moot because the people involved in the dispute have died.

I think they were wrong, but the point is moot. Their decision has been made and it can't be changed now.

Verb

And it was they, not the British, who slapped down any suggestion of democratic reform when it was quietly mooted by British colonial officers in the 1950s. — Ian Buruma , New Republic ,

… he looked for an easy way out. A spot in the stateside Guard would have suited him fine; in the event, he dodged and weaved until a low draft number came along to moot his problem. — Hendrik Hertzberg , New Yorker ,

And then the word comes of Ted's inoperable pancreatic cancer, and death moots the long conflict. — Richard Rhodes , New York Times Book Review ,

conservatives had shouted down the proposal when it was first mooted

the issue of whether a person's nature or upbringing is more important continues to be mooted by experts and laymen alike