OK - Wikipedia
OK (/ ˌoʊˈkeɪ / ⓘ), with spelling variations including okay, O.K. and many others, is an English word (originating in American English) denoting approval, acceptance, agreement, assent, acknowledgment, or a sign of indifference. OK is frequently used as a loanword in other languages.

OK Definition & Meaning - Merriam-Webster
The meaning of OK is all right. How to use OK in a sentence.

OK Definition & Meaning | Dictionary.com
OK definition: all right; proceeding normally; satisfactory or under control. See examples of OK used in a sentence.

OK definition in American English | Collins English Dictionary
(used to express agreement, understanding, acceptance, or the like) OK, I'll get it for you

OK, adj., int.¹, n.², adv. meanings, etymology and more ...
Ugandan English. OK please: used to express assent, concession, or approval, esp. with regard to a previous statement, question, or request: ‘yes’, ‘all right’, ‘ok’.

How ‘OK’ Became America’s Favorite Word - HISTORY
While OK became part of the popular lexicon, its origins were disputed for more than a century. Some linguists pointed to Van Buren and Jackson.

OK Definition & Meaning - YourDictionary
OK definition: Satisfactory or agreeable; acceptable.

Ok - Definition, Meaning & Synonyms | Vocabulary.com
Anything that's ok is all right or fine. A perfectly ok answer when your dad asks how your homework is going is "Ok."

OK: Definition, Meaning, and Examples - usdictionary.com
The word "OK" is a common expression in the English language, with "okay" being a later spelling variant derived from it. Its primary meanings include indicating agreement, acceptance, or approval and signifying that something is satisfactory or adequate.

OK - definition of OK by The Free Dictionary
1. all right; satisfactory: Is everything OK? 2. correct, permissible, or acceptable. 3. feeling well. 4. safe; sound.