<p><strong>Verb (used with object)</strong></p><ul><li>To perceive or understand as fact or truth; to apprehend clearly and with certainty: I know the situation fully.</li><li>To have established or fixed in the mind or memory: to know a poem by heart; Do you know the way to the park from here?</li><li>To be cognizant or aware of: I know it.</li><li>To be acquainted with (a thing, place, person, etc.), as by sight, experience, or report: to know the mayor.</li><li>To understand from experience or attainment (usually followed by how before an infinitive): to know how to make gingerbread.</li><li>To be able to distinguish, as one from another: to know right from wrong.</li><li>Archaic: to have sexual intercourse with.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>To have knowledge or clear and certain perception, as of fact or truth.</li><li>To be cognizant or aware, as of some fact, circumstance, or occurrence; have information, as about something.</li></ul><p><strong>Noun</strong></p><ul><li>The fact or state of knowing; knowledge.</li></ul>