noun

• (pathology) An obstruction or occlusion of an blood vessel by an embolus, that is by a blood clot, air bubble or other matter that has been transported by the blood stream.
• The insertion or intercalation of days into the calendar in order to correct the error arising from the difference between the civil year and the solar year.
• (Christianity) An intercalated prayer for deliverance from evil coming after the Lord's Prayer.
• (Roman Catholicism) The variable body of a liturgical preface, between the protocol and eschatocol, typically stating the motive for worship on a given day.