. "\"OK\" (also spelled \"okay\", \"ok\", or \"O.K.\") is a word denoting approval, acceptance, agreement, assent, or acknowledgment. \"OK\", as an adjective, can also express acknowledgment without approval. \"OK\" has frequently turned up as a loanword in many other languages.As an adjective, \"OK\" means \"adequate\", \"acceptable\" (\"this is OK to send out\"), \"mediocre\" often in contrast to \"good\" (\"the food was OK\"); it also functions as an adverb in this sense."@en . . .