okay

adjective
  1. satisfactory; acceptable; all right
  2. Usage: informal
adverb
  1. in a satisfactory manner; well enough
  2. Usage: informal
interjection
  1. used to express agreement or acceptance
  2. Usage: informal
noun
  1. approval or permission
  2. Usage: informal
verb
  1. to approve or give permission for something
  2. Usage: informal

Examples