<p><strong>Adjective</strong></p><ul><li>All right; proceeding normally; satisfactory or under control: Things are OK at the moment.</li><li>Correct, permissible, or acceptable; meeting standards: Is this suit OK to wear to a formal party?</li><li>Doing well or in good health; managing adequately: She's been OK since the operation.</li><li>Adequate but unexceptional or unremarkable; tolerable: The job they did was OK, nothing more.</li><li>Estimable, dependable, or trustworthy; likable: an OK person.</li></ul><p><strong>Adverb</strong></p><ul><li>All right; well enough; successfully; fine: She'll manage OK on her own. He sings OK, but he can't tap dance.</li><li>(Used as an affirmative response) yes; surely.</li><li>(Used as an interrogative or interrogative tag) all right?; do you agree?</li></ul><p><strong>Interjection</strong></p><ul><li>(Used to express agreement, understanding, acceptance, or the like): OK, I'll get it for you.</li><li>(Used as an introductory or transitional expression): OK, now where were we?</li></ul><p><strong>Noun</strong></p><ul><li>Plural OK's.</li><li>An approval, agreement, or endorsement: They gave their OK to her leave of absence.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>OK'd, OK'ing.</li><li>To put one's endorsement on or indicate one's approval of (a request, piece of copy, bank check, etc.); authorize; initial: Would you OK my application?</li></ul>