all right
(also alright)
adjective
adverb

Phrases
-
it's all right for——
- used to suggest that someone is luckier than you: it was all right for them! They didn’t have to put up with the brat trailing after them “It’s all right for some,” Grandad huffed
-
it'll be all right on the night
- used to say that a performance or event will be successful even if the preparations have not gone well: the organizers assure everyone that it will all be all right on the night

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.

Spelling help
Although all right can also be spelled alright, you should use all right in formal writing.