Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Ok" Definition
noun
An authorization or approval:.
Source: Oxford Dictionary
adjective
Alternative capitalization of OK.
Source: Wiktionary
Satisfactory but not especially good:.
Source: Oxford Dictionary
abbreviation
Oklahoma.
Source: Merriam-Webster
verb
Give approval to:.
Source: Oxford Dictionary
adverb
In a satisfactory manner or to a satisfactory extent:.
Source: Oxford Dictionary
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