Is OK a word?
On #ThisDayInHistory 1839, the initials “O.K.” are first published in The Boston Morning Post. Meant as an abbreviation for “oll korrect,” a popular slang of “all correct” at the time, OK steadily made its way into the everyday speech of Americans.
adverb or adjective \ō-ˈkā, in assenting or agreeing also ˈō-ˌkā\
Popularity: Top 40% of words
Simple Definition of OK: fairly good : not very good or very bad : acceptable or agreeable: not ill, hurt, unhappy, etc.
Source: Merriam-Webster's Learner's Dictionary
OK is listed as a word at .merriam-webster.com/dictionary