Definitions:

1. an endorsement noun
   • We got the ok from the president.
2. being satisfactory or in satisfactory condition adjective
   • The watch is ok.
3. in a satisfactory or adequate manner adverb
   • They'll do okay on their own.
4. to give sanction to verb
   • I oked the resolution.

Synonyms:

• all right
• alright
• fine
• hunky-dory
• O.K.
• OK
• okey
• sanction