Webster's English Dictionary

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ok

1. OK or okay \o--'ka-, in assenting or agreeing also 'o--.ka- or 'o|\ 
   av(or aj) [abbr. of oll korrect, alter. of all correctB.-.ka- : all right 
2. OK or okay \o--'ka-\ vt or OK'd or okayed;  or OK'.ing;  or okay.ing : 
   APPROVE, AUTHORIZE 
3. OK or okay \o--'ka-\ n : APPROVAL, ENDORSEMENT