Definition of "all right"

The dread of most etherizers is a quiet breather who may stop breathing without his notice, and requires the almost constant presence of his ear at the patient's mouth to be sure he or she is all right.

1903, William Brodie, Carl Jungk, Francis Edward Stewart, The Therapeutic Gazette, page 536

‘No. I only opened the door a foot and put my head in. The street lamps shine into that room. I could see him. He was all right. Sleeping like a great grampus. Poor, poor chap.’

1963, Margery Allingham, chapter 20, in The China Governess‎

Next I called my dear friend Nellie Connally in Dallas. We had been close to Nellie and John for many years, sharing moments of sorrow and happiness alike. She reported that the surgeon had just finished operating and that John was going to be all right.

1971, Lyndon Johnson, “The Beginning”, in The Vantage Point‎, Holt, Reinhart & Winston, page 16

Presently there came a loud ring, then a decided voice, asking for 'Mr. Laurie', and a surprised-looking servant came running up to announce a young lady. "All right, show her up, it's Miss Jo," said Laurie, going to the door of his little parlor to meet Jo, who appeared, looking rosy and quite at her ease, with a covered dish in one hand and Beth's three kittens in the other.

1868, Louisa May Alcott, Little Women