A/O

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AcronymDefinition
A/OAt Once
A/OAs Of
A/OAnalog Output
A/OArea of Operations
A/OAlert and Oriented (charting a patient's mental status)
A/OAcoustic/Optic (spectroscopy)
A/OAccounting Only
A/OAtomic Weight Percent
References in classic literature ?
The miller thought she must mean one of his puppies or kittens, so promised the nixy at once what she asked, and returned to his mill full of hope.
The man in his terror consented to everything, and when the woman was brought to bed, the enchantress appeared at once, gave the child the name of Rapunzel, and took it away with her.
The best means, sire, to put your life in security, is to send for him at once, and to cut off his head directly he comes," said the vizir.
With my brow to the glass, I was thus occupied in scrutinizing the mob, when suddenly there came into view a countenance (that of a decrepid old man, some sixty-five or seventy years of age,) - a countenance which at once arrested and absorbed my whole attention, on account of the absolute idiosyncrasy of its expression.
He did at once, and without the smallest effort, keep the promise he had made her--always to think well of all men, and to like everyone always.
The old woman glanced for a moment at the pledge, but at once stared in the eyes of her uninvited visitor.
The driver, on the other hand, was pleased to drop again upon so liberal a fare; and as he was a man - the reader must already have perceived - of easy, not to say familiar, manners, he dropped at once into a vein of friendly talk, commenting on the weather, on the sacred season, which struck him chiefly in the light of a day of liberal gratuities, on the chance which had reunited him to a pleasing customer, and on the fact that John had been (as he was pleased to call it) visibly 'on the randan' the night before.
All at once he fell head over heels in the dark, down a hole, and landed on a heap of very dirty rags.