Correct meaning of "OK" is the name of a German engineer Otto Krovens who worked for Ford car company in America.

As chief inspector he wrote his initial as OK upon each car he passed.
Hence it continued till date as All correct

Do we know actual full form of some words?

💛 News paper 💛
North East West South past and present events report.

💛 Chess  💛
  Camel, Horse, Elephant, Soldiers.

💛 Cold 💛
  Chronic Obstructive Lung Disease.

💛 Joke
 Joy of Kids Entertainment.

💛 Aim  💛
  Ambition in Mind.

💛 Date
 Day and Time Evolution.

💛 Eat 💛
 Energy and Taste.

💛 Tea 💛
Taste and Energy Admitted.

💛 Pen 💛
 Power Enriched in Nib.

💛 Smile 💛
Sweet Memories in Lips Expression.

💛 SIM 💛
Subscriber Identity Module

💛 etc. 💛
 End of Thinking Capacity.

💛 Or 💛
Orl Korec (Greek Word)

💛 Bye 💛
Be with you Everytime.