O.K.

definition: in a satisfactory or adequate manner
example:
speech part: adverb
synonyms: o.k. ok okeh okay
definition: an endorsement
example: they gave us the O.K. to go ahead
speech part: noun
synonyms: o.k. ok okeh okay
definition: give sanction to
example:
speech part: verb
synonyms: sanction

How O.K. is being used?