Alright

wiktionary

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From all +‎ right. Compare Old English eallriht(“all-right, just, exactly”), equivalent to al-(“all”) +‎ right.

etymonline

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alright

frequent spelling of all right, attested in print by 1884.

There are no such forms as all-right, or allright, or alright, though even the last, if seldom allowed by the compositors to appear in print, is often seen ... in MS. [Fowler]