This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Third-person singular simple present indicative form of atone.

At once; immediately.

At one and the same time.

"“Mme. de Beauseant is descended from the House of Burgundy, on the spindle side, ’tis true, but the name atones for everything."

stones   

atone