co;in;cide pronunciation: function: intransitive verb inflected form(s): co;in;cid;ed; co;in;cid;ingetymology: medieval latin coincidere, from latin co- + incidere to fall on, from in- + cadere to fall — more at chancedate: 1719 1 a : to occupy the same place in space or time b : to occupy exactly corresponding or equivalent positions on a scale or in a series2 : to correspond in nature, character, or function3 : to be in accord or agreement : concursynonyms see agree