The merging of all and right to form the one-word spelling alright is not recorded until the end of the 19th century （unlike other similar merged spellings such as altogether and already, which date from much earlier）. There is no logical reason for insisting on all right as two words, when other single-word forms such as altogether have long been accepted. Nevertheless it is still considered by many people to be unacceptable in formal writing. In the British National Corpus around 5 per cent of citations for the two forms are for the one-word form alright.