English Usage - alright.

There is no logical reason for insisting that alright is incorrect and should always be written as all right, when other single-word forms such as altogether have long been accepted. The fact that alright is not recorded until the end of the 19th century, while other similar merged spellings such as altogether and already date from much earlier, is no reason for denouncing it, but it is still considered by many people to be unacceptable in formal writing.
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