<p><strong>Noun</strong></p><ul><li>Coincidence in time; contemporaneousness; simultaneity.</li><li>The arrangement or treatment of synchronous things or events in conjunction with one another, as in a history.</li><li>A tabular arrangement of historical events or personages, grouped according to their dates.</li><li><strong>Physics, Electricity:</strong> The state of having the same frequency and zero phase difference.</li><li>(In the psychology of Carl Jung) The simultaneous occurrence of causally unrelated events and the belief that the simultaneity has meaning beyond mere coincidence.</li></ul>