okay

O.K. adverb in a satisfactory or adequate manner; `she`ll do okay on her own`; `held up all right under pressure`; (`alright` is a nonstandard variant of `all right`)
Found on https://www.encyclo.co.uk/local/20974

Okay

Okay was slang and is now colloquial English for all right, correct.
Found on http://www.probertencyclopaedia.com/browse/ZO.HTM

okay

[adv] - (informal) in a satisfactory or adequate manner
Found on http://www.webdictionary.co.uk/definition.php?query=okay
No exact match found